Tutor MathsGuru: Ask me for your burning Maths questions!

[xuanwilliam]

avell:

Dear all


Pls help me for the following questions:-

Qn (1)
4/5 of John's money is equal to 3/8 of Sarah's money. Express Sarah's money as a ratio of John's money in it simplest form (draw a model to help you to solve the sum.

Qn (2)
The ratio of boys and girls on a school bus was 2 : 3. When 16 girls alighted from the bus, the ratio of the remaining boys to girls became 6:5. Find the number of children who remained on the bus.

Qn (1)
Make the Numerator of the fractions the same : 4/5*3=12/15
3/8*4=12/32

So the denominator is the total amount for each person.
The ratio would be
J:S
15:32
Qn(2)
Before
B:G
2:3

After
B:G
6:5

The number of boys did not change so....
Before
B:G
2:3
*6 *6
12:18

After
B:G
6:5
*2 *2
12:10

18-10=8
8u = 16
1u = 2
12+10=22
22u = 44

Number of Children remained : 44

[Bunny27]

Thank you!


uote=\"CoffeeCat\"]

Bunny27:

Need help for this question:

1. Machine A can make 240 cookies in 5 minutes and Machine B can make 128 cookies in 4 minutes. How long will it take to make 2000 cookies if both machines are operating at the same time ?

Thanks

For such rate questions involving 2 or more workers, 1 generic method is just to find the combined rate.
Rate of Machine A : 48 cookies in 1 min
Rate of Machine B : 32 cookies in 1 min
Combined rate of A & B : 80 cookies in 1 min
Hence time taken : 2000 / 80 = 25 mins[/quote]

[Musicstar]

Dear all,


Please help me these question. Thank you.

1) In May, the ratio of Karen’s weight to Huiyu’s weight was 6:5. In June , Huiyu put on 5kg and Karen lost 3kg. As a result, both of them had the same weight. What was Huiyu’s weight in May?

2)The ratio of the number of Sally’s stickers to the number of Willy’s stickers was 4:1. After Sally bought another 13 stickers and Willy received 7 more stickers from his teacher, the ratio of Sally’s stickers to Willy’s stickers became 3:1 . How many stickers did Sally have at first?

3) Peter, Ali and Samy shared some marbles in the ratio of 2:4:7. They decided to play some games with their marbles in the playground. In the first game, Samy lost 8 marbles to Peter. Peter then had the same number of marbles as Ali. In the second game, Samy won some marbles from Ali but Ali lost some of his marbles in the tall grass and could not find them. The new ratio of marbles among the three boys was
Peter : Ali : Samy
2 : 1 : 3

(a) How many marbles did Peter have after the 1st game?
(b) How many more marbles does Samy have then Ali after 2nd game?

[wkong]

Dear all,

Need help for the following question:
At a party, each of the 54 men talked to 3 women while each woman talked to 2 men. Find the number of women at the party.

Thanks in advance.

[sharmi]

Hi , Can you help me out with this P3 Problem. Appreciate if you can explain using Model. Thanks in advance.


Jeane,Agnes and Brinda has 108 Stamps. Jeane gave Agnes as many stamps as Agnes had. Agnes then gave Brinda as many stamps as Brinda had. As a result, each of them had the same number of stamps. How many stamps did Agnes receive from Jeane?

[Neat]

[quote]Hi!


I need help for this question:

Audrey had thrice as much money as her brother. After her father gave her $25 and her brother $35, Audrey now has twice as much money as her brother. How much money did Audrey have at first?

Thanks[/quote]

[jieheng]

Neat:

[quote]Hi!


I need help for this question:

Audrey had thrice as much money as her brother. After her father gave her $25 and her brother $35, Audrey now has twice as much money as her brother. How much money did Audrey have at first?

Thanks

[/quote]Audrey [--------][--------][--------][--25--]

Brother [--------][---35--]



Audrey [--------][---35--][--------][---35--]

Brother [--------][---35--]

Compare the models of Audrey ,

3u+25 -----> 2u+70

1u -----> 45

The amount of money that Audrey had at first = 3u = 3*45 = $135(Ans)

[Neat]

jieheng:

Neat:

[quote]Hi!


I need help for this question:

Audrey had thrice as much money as her brother. After her father gave her $25 and her brother $35, Audrey now has twice as much money as her brother. How much money did Audrey have at first?

Thanks

Audrey [--------][--------][--------][--25--]

Brother [--------][---35--]



Audrey [--------][---35--][--------][---35--]

Brother [--------][---35--]

Compare the models of Audrey ,

3u+25 -----> 2u+70

1u -----> 45

The amount of money that Audrey had at first = 3u = 3*45 = $135(Ans)[/quote][quote]Hi!

Thanks for the prompt reply.

I am quite slow. I would like to know why need to add 2 times of $35 to Audrey's model? and what happens to $25?

Thanks in advance.[/quote]

[jieheng]

Neat:

After her father gave her $25 and her brother $35
Audrey [--------][--------][--------][--25--]

Brother [--------][---35--]


Audrey now has twice as much money as her brother
Audrey [--------][---35--][--------][---35--]

Brother [--------][---35--]

Compare the models of Audrey ,

3u+25 -----> 2u+70

1u -----> 45

The amount of money that Audrey had at first = 3u = 3*45 = $135(Ans)

[quote]Hi!

Thanks for the prompt reply.

I am quite slow. I would like to know why need to add 2 times of $35 to Audrey's model? and what happens to $25?

Thanks in advance.[/quote]After her father gave her $25 and her brother $35, Audrey now has twice as much money as her brother

[MathIzzFun]

wkong:

Dear all,

Need help for the following question:
At a party, each of the 54 men talked to 3 women while each woman talked to 2 men. Find the number of women at the party.

Thanks in advance.

Hi

For every 2 men, there are 3 women.

So number of women = 54 / 2 x 3 = 81

cheers.