Q&A - P5 Math

[2Transformer]

MathIzzzFun:

2Transformer:

Please help on the following questions:-


2. Robert wanted to buy 12 erasers but he found that he was short of $0.80. If he bought 8 erasers, he would have $1.60 left over. How much money did Robert have?

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4 erasers --> $ 1.60 + $0.80 = $ 2.40

1 eraser --> $ 0.60

Robert's money --> 8 x $ 0.60 + $ 1.60 = $ 6.40

cheers.

:thankyou:

[2Transformer]

MathIzzzFun:

2Transformer:

Please help on the following questions:-


3. There were 3/4 as many students in Camp A than in Camp B. After 25 pupils joined Camp B, the ratio of the number of students in Camp B to Camp A becomes 7:4. Find the number of students in Camp B at first.

The number of students in Camp A remained the same, so make the ratio part for Camp A the same in the \"start\" and \"end\" ratios.

At first, students in Camp A : Camp B = 3 : 4 --> 12u : 16u
In the end, students in Camp A : Camp B --> 4 : 7 --> 12u : 21u

Increase in number of students in Camp B = 21u - 16u = 5u

5u --> 25
1u --> 5

At first, number of students in Camp B --> 16 x 5 = 80

cheers.

:thankyou: MathIzzzFun, thank you for your detailed n yet simple explaination. I really appreciate it.

[MathIzzzFun]

cookieandmonster:

Please help with this question:


Peter had 632 stamps and Freddy had 80 stamps. After their father had given them each an equal number of stamps, Peter had 5 times as many stamps as Freddy. How many stamps did their father give to each of them?

key concept --> difference/gap remains the same...

when same quantity/amount is added/removed from two identities, the difference between the two identities will remain the same ...

http://i40.tinypic.com/i2u68g.png\">

Peter had 632 stamps and Freddy had 80 stamps. After their father had given them each an equal number of stamps, Peter had 5 times as many stamps as Freddy. How many stamps did their father give to each of them?

At first,
Peter -> 632 stamps
Freddy --> 80 stamps
632 - 80 = 552 --> Peter had 552 more stamps then Freddy

In the end,
Peter --> 5 units
Freddy --> 1 unit

5 units - 1 unit = 4 units

since both received the same number of stamps from their father, Peter will still have 552 more stamps than Freddy in the end,

4 units --> 552
1 unit --> 138

Number of stamps each received --> 138 - 80 = 58

cheers.

[MathIzzzFun]

2Transformer:

MathIzzzFun:

[quote=\"2Transformer\"]Please help on the following questions:-


1. Mr. Yong gave $840 of his salary to his mother and gave 1/5 of his remaining salary to his wife. If he had 1/3 of his salary left, how much was his salary?

Remainder --> 5 units
wife --> 1 unit
Left --> 4 units = 1/3 of salary
salary --> 12 units

12 units - 5 units = 7 units --> $840
1 unit --> $ 120

salary --> 12 x $120 = $ 1440

cheers.

:thankyou: MathIzzzFun !! My son likes ALL your explaination.[/quote]glad to be of help .. cheers!

[doraemo]

please help:


1.\tThere were some orange beads and 28 red beads and green beads in a container. There were two more green beads than red beads, and 6 fewer orange beads than red. How many beads were there altogether?

2.\tJar Y has 22 more sweets than Jar Z and Jar Z has 16 more sweets than Jar X. The total number of sweets in Jars Y and Z is 5 times the number of sweets in Jar X.

(a)\tHow many sweets are there altogether?
(b)\tHow many sweets should be transferred from Jar Y to the other two Jars so that there is an equal number of sweets in all three jars?

[MathIzzzFun]

doraemo:

please help:


1.\tThere were some orange beads and 28 red beads and green beads in a container. There were two more green beads than red beads, and 6 fewer orange beads than red. How many beads were there altogether?

28 red beads and green beads in a container. There were two more green beads than red beads.

Red beads --> (28-2)/2 = 13
Green beads --> 15
Orange beads --> 13 - 6 = 7

Total number of beads --> 28 + 7 = 35

cheers.

[MathIzzzFun]

doraemo:

please help:


2.\tJar Y has 22 more sweets than Jar Z and Jar Z has 16 more sweets than Jar X. The total number of sweets in Jars Y and Z is 5 times the number of sweets in Jar X.

(a)\tHow many sweets are there altogether?
(b)\tHow many sweets should be transferred from Jar Y to the other two Jars so that there is an equal number of sweets in all three jars?

http://i39.tinypic.com/2yo506u.png\">

3 units --> 16 x 2 + 22 = 54
1 unit --> 18

Jar X --> 18 sweets
Jar Y --> 56 sweets
Jar Z --> 34 sweets
Total --> 108 sweets

108 / 3 = 36

Number of sweets to transfer:
Jar Y to Jar Z --> 36 - 24 = 2 sweets
Jar Y to Jar X --> 36 - 18 = 18 sweets
Total transferred from Jar Y to Jar X & Jar Z --> 20 sweets

cheers.

[doraemo]

Thank you very much, MathIzzzFun!!!

[Awonder]

Hi, pls help on the following Q. Thank you.


Mrs Tan baked 186 chocolate cookies and peanut cookies. After 1/4 chocolate cookies were sold and 1/5 of the peanut cookies were sold, she had the same number of chocolate cookies and peanut cookies left. How many cookies were sold altogether?

[S-H]

Can someone please help me with this question, thanks!


John bought 4 times as many candy bars as chocolate bars. The total mass of candy bars and chocolate bars was 1.64kg. The mass of chocolate bars was 0.84kg heavier than that of candy bars. The mass of 1 bar of chocolate was 0.228kg heavier than 1 candy bar. Find the number of chocolate bars John bought.