Q&A - P5 Math

[bookwormkids]

MathIzzzFun:

bookwormkids:

Four children Ken, Lionel, Melvin and Nick each have some marbles.

The number of marbles that Ken has is 1/2 of the total number of marbles that Lionel, Melvin and Nick have.1:2--> total 3
The number of marbles that Melvin has is 1/4 of the total Ken, Lionel and Nick have.1:4--> total 5
The number of marbles that Lionel has is 2/3 of the total number of marbles that Ken, Melvin and Nick have.2:3--> total 5
If Nick has 44 marbles, how many marbles should Lionel give to Melvin so that Ken & Melvin have the same number of marbles?

Thanks!

Hi

The total number of marbles remain the same.

Ken : Ken+Lionel+Melvin+Nick --> 5u : 15u
Melvin: Ken+Lionel+Melvin+Nick --> 3u : 15u
Lionel: Ken+Lionel+Melvin+Nick --> 6u: 15u
Nick --> 15u - 5u - 3u - 6u = 1u; Nick has 44 marbles
1u --> 44

Melvin --> 132 marbles
Ken --> 220 marbles
220 - 132 = 88 --> Lionel needs to give 88 marbles to Melvin


cheers.

Hi MathIzzzFun,

Thank you so much!

[MathIzzzFun]

MJNB:

Hi, Can anyone help in these questions,


(1) Hanson had some one-dollar coins and some fifty-cent coins. The ratio of the number of one-dollar coins to the number of fifty-cents coins ha had was 2:5. Hanson took 140 fifty-cents coins to the bank and changed these fifty-cents coins for the same value of one-dollar coins. In the end, the number of one-dollar coins to the number of fifty-cents coins he had became 5:2. Find the value of the fifty-cent coins Hanson had at first.
TIA.

this question was discussed ...

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&p=817421#p817421

cheers.

[MathIzzzFun]

MJNB:

Hi, Can anyone help in these questions,


(2) AB Primary School organised a 2-day Charity Funfair. Admisson tickets were sold to every visitors at a cost of $40. On the first day, 120 more children visited the funfair than adults. The number of children on the second day was 25% more than the number of children on the first day. The number of adults on the second day was 5% less than the number of adults on the first day. There were a total of 2570 people at the funfair ont he second day.
(a) Find the number of adults at the funfair on the first day.
(b) What was the total sum of money collected from the sale of the admission tickets for both days?


TIA.

Day 1
Adults --> 20 units --- 5% = 1 unit
Children --> 20 units + 120 ----- 25% = 5 units + 30

Day 2
Adults --> 19 units
Children --> 25 units + 150
Total --> 44 units + 150 = 2570
1 unit --> 55

..can you continue from here ?

cheers.

[MathIzzzFun]

MJNB:

Hi, Can anyone help in these questions,

(3) Hotel H and Hotel B had a total of 5200 guests. After 3/4 of the guests in Hotel H and 3/5 of the guests in Hotel B checked out, Hotel B has 260 more guests than Hotel H. How many guests did Hotel H have at first?

TIA.

this question was discussed ...

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=1150

cheers.

[ozora]

Can anyone help to verify my answer of these following questions:

1.I bakes 18 more fruit cakes than choco cakes. After giving away 35 cakes of each type, the number of choco cakes became 75% of the number of fruit cakes. How many choco cakes is left?
Answer 81.

2. If I buy 5 files, I will have $4 left. If I buy9 files, I will need another $5 . How much money do I have ?

[MathIzzzFun]

ozora:

Can anyone help to verify my answer of these following questions:

1.I bakes 18 more fruit cakes than choco cakes. After giving away 35 cakes of each type, the number of choco cakes became 75% of the number of fruit cakes. How many choco cakes is left?
Answer 81.

2. If I buy 5 files, I will have $4 left. If I buy9 files, I will need another $5 . How much money do I have ?

Hi

1. key concept here is --> same number of each type of cakes was given away, so the difference between the number of cakes will remain the same after the sale.
Answer is 54 choco cakes.

2. After buying 5 files, $4 left. To buy 9 files --> buy 4 more files, need another $5, so total of ($4+$5)= $9 needed to buy 4 files... can you continue from here?

cheers.

[ozora]

MathIzzzFun:

ozora:

Can anyone help to verify my answer of these following questions:

1.I bakes 18 more fruit cakes than choco cakes. After giving away 35 cakes of each type, the number of choco cakes became 75% of the number of fruit cakes. How many choco cakes is left?
Answer 81.

2. If I buy 5 files, I will have $4 left. If I buy9 files, I will need another $5 . How much money do I have ?

Hi

1. key concept here is --> same number of each type of cakes was given away, so the difference between the number of cakes will remain the same after the sale.
Answer is 54 choco cakes.

2. After buying 5 files, $4 left. To buy 9 files --> buy 4 more files, need another $5, so total of ($4+$5)= $9 needed to buy 4 files... can you continue from here?

cheers.

Q2. i got the answer is $15.25. sorry forgot to add in the answer.

as for Q1 . i am slight confused.
i gathered that choco has 3 units while fruits has 4 units in the end.
based on the difference , it will be 35-18=17
17x3=51.
so any part which is wrong?

[MathIzzzFun]

ozora:

MathIzzzFun:

[quote=\"ozora\"]Can anyone help to verify my answer of these following questions:

1.I bakes 18 more fruit cakes than choco cakes. After giving away 35 cakes of each type, the number of choco cakes became 75% of the number of fruit cakes. How many choco cakes is left?
Answer 81.

2. If I buy 5 files, I will have $4 left. If I buy9 files, I will need another $5 . How much money do I have ?

Hi

1. key concept here is --> same number of each type of cakes was given away, so the difference between the number of cakes will remain the same after the sale.
Answer is 54 choco cakes.

2. After buying 5 files, $4 left. To buy 9 files --> buy 4 more files, need another $5, so total of ($4+$5)= $9 needed to buy 4 files... can you continue from here?

cheers.

Q2. i got the answer is $15.25. sorry forgot to add in the answer.

as for Q1 . i am slight confused.
i gathered that choco has 3 units while fruits has 4 units in the end.
based on the difference , it will be 35-18=17
17x3=51.
so any part which is wrong?[/quote]In the end,
Fruit cakes --> 4 units
Choco cakes --> 3 units
Since there are 18 more fruit cakes than choco cakes (difference remain the same), 1 unit --> 18

cheers.

[ozora]

MathIzzzFun:

ozora:

[quote=\"MathIzzzFun\"][


Q2. i got the answer is $15.25. sorry forgot to add in the answer.

as for Q1 . i am slight confused.
i gathered that choco has 3 units while fruits has 4 units in the end.
based on the difference , it will be 35-18=17
17x3=51.
so any part which is wrong?

In the end,
Fruit cakes --> 4 units
Choco cakes --> 3 units
Since there are 18 more fruit cakes than choco cakes (difference remain the same), 1 unit --> 18

cheers.

[/quote]thanks Maths. so the difference is constant. got it

[Udon]

pls help...Thanks in advance.


Q1. In a Maths Olympiad, Team A and Team B each has an equal number of pupils. The total number of pupils in each team is less than 10. The average score of the pupils in Team A is 48 marks. The average score of the pupils in Team B is 62 marks. The total score of Team B is 42 marks more than that of Team A.

Find the number of pupils in each team.