Q&A - P5 Math

[YumYum]

Hi MathIzzzFun and TeachingMum, thank you for your detailed explanation.

[MathIzzzFun]

YumYum:

Hi MathIzzzFun and TeachingMum, thank you for your detailed explanation.

u r welcome

cheers.

[MathIzzzFun]

Bunny27:

Sorry another question needs help;


Meiling puts some money in boxes P,Q,R and S. The amount of money in box P is 1/2 of the amount in boxes Q,R and S. The amount of money in box Q is 1/5 of the total amount of money in boxes P,R and S. The amount of money in box R is 1/6 of the total amount of money in P,Q and S. If there is $135 in box S, what is the total amount of money in the four boxes?

Thanks

:?]

Hi

P:Q R S = 1:2, P : P Q R S = 1 : 3
Q: P R S = 1:5, Q : P Q R S = 1 : 6
R: P Q S = 1:6, R : P Q R S = 1 : 7

Make P Q R S = 42u

P:P Q R S = 14u : 42u, Q: P Q R S = 7u : 42u, R: P Q R S = 6u : 42u
S = 42u - 14u - 7u - 6u = 15u = $ 135, 1u = $9

Total amount = 42u = 42 x $9 = $378

cheers.

[peggy]

Hi,


Please assist :

Yili, Lynn and Devi went shopping. Yili spent 0.25 of the total amount Lynn and Devi spent, while Devi spent 4/11 of the total amount Yili and Lynn spent. Lynn spent $37.50 more than Yili. If Lynn had $90 before she went shopping, what fraction of her money did she spend ? Express your answer in its simplest form.

thank you !!

[MathIzzzFun]

peggy:

Hi,


Please assist :

Yili, Lynn and Devi went shopping. Yili spent 0.25 of the total amount Lynn and Devi spent, while Devi spent 4/11 of the total amount Yili and Lynn spent. Lynn spent $37.50 more than Yili. If Lynn had $90 before she went shopping, what fraction of her money did she spend ? Express your answer in its simplest form.

thank you !!

Hi

same approach as the PQRS question...

Devi: Yili + Lynn = 4 : 11, Devi : Yili + Lynn + Devi = 4 : 15
Yili: Lynn + Devi = 1:4, Yili: Yili + Lynn + Devi = 1: 5 = 3 : 15

Devi:Yili:Lynn : Yili+Lynn+Devi
= 4u : 3u : (15u-4u-3u) : 15u
= 4u : 3u : 8u : 15u
So 8u - 3u = $37.50... I think you can complete the rest..

cheers.

[peggy]

Hi Mathizzzfun,


Thank you so much for your prompt reply !!

Have a great day !

[Bunny27]

Needs help;


1/5 of Steven’s age is 1/7 of Derek’s age. In 6 years’ time, their total age will be 72 years.
A) what is their total age now?
B) how old will Derek be in 6 years’ time?

Thanks.

[Muffins]

Bunny27:

Needs help;

1/5 of Steven's age is 1/7 of Derek's age. In 6 years' time, their total age will be 72 years.
A) what is their total age now?
B) how old will Derek be in 6 years' time?

Thanks.

So, from the question, we get this - Derek = 7 units, Steven = 5 units.

Thus, 12 units + 12 (have to add 6 to BOTH of them, thus 12) = 72

So 12 units = 60 → answer to part A

1 unit = 5

Thus, Derek's age now → 5*7 = 35

So in 6 years time, he would be → 35 + 6 = 41

[Bunny27]

Pls assist me this question:


Jane has $60 more than Candice. If Candice gives Jane $20, the amount of money Jane has will be thrice that of Candice’s. How much does each of them have ?

Thank u:)

[HeSheMe]

Bunny27:

Pls assist me this question:


Jane has $60 more than Candice. If Candice gives Jane $20, the amount of money Jane has will be thrice that of Candice's. How much does each of them have ?

Thank u:)

Draw a model to solve this question.

You will realise that two units are actually $20+$20+$60 which is $100.

Alternatively at last Candice has one unit. If she didn't give she would have 1u + $20. And as for Jane, if she didn't receive, she would have 3u - $20.

And that you know that Jane has $60 more than Candice. So that means that

1u + $20 = 3u - $20 - $60
$20 + $20 + $60 = 2u
2u = $100
1u = $50

Candice: $50 + $20 = $70
Jane: $70 + $60 = $130