Q&A - P5 Math

[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

[blueymum]

Dear all…


Need some help with the following question.

When a tin of paint is 1/2 full, it weighs 5kg.
When it is 1/3 full, it weighs 4kg. What is the weight of tin when it is full?


Thank you!!

[MathIzzzFun]

blueymum:

Dear all..


Need some help with the following question.

When a tin of paint is 1/2 full, it weighs 5kg.
When it is 1/3 full, it weighs 4kg. What is the weight of tin when it is full?


Thank you!!

Hi

Total 6 units of paint when full ( common multiple of 2 & 3)
[Empty Tin][3 units of paint] = 5kg
[Empty Tin][2 units of paint] = 4 kg
1 unit of paint = 5 - 4 = 1kg
So, total mass of the tin when full = 5 kg + 3 units of paint = 5 kg + 3 kg = 8 kg

cheers.

[blueymum]

Thanks so much.


Would it be possible to use model to solve? The teacher has asked the students to solve using the model approach.

Thanks once again.

[MathIzzzFun]

blueymum:

Thanks so much.


Would it be possible to use model to solve? The teacher has asked the students to solve using the model approach.

Thanks once again.

Hi

yes.. as per the solution..

empty tin = big block
paint = 6 smaller blocks

First model - big block + 3 smaller blocks with 3 dotted blocks = 5 kg
2nd model - big block + 2 smaller blocks with 4 dotted blocks = 4 kg

cheers.