## Q&A - PSLE Math

- mummyscopio
- BlueBelt
**Posts:**228**Joined:**Fri Dec 05,**Total Likes:**2

### Re: Q&A - PSLE Math

EC72 wrote:

Please help with part b) of this question. Thank you.

Ratio of

Value of 10¢ : value of 20¢ : value of 50¢

3 : 2 : 1

(A) 3/6 = ½ of the money was in 10¢ coins.

Value of 10¢ : value of 20¢ : value of 50¢

3u : 2u : 1u

6u : 4u : 2u

-3u : : -$6(12 50¢-coins)

----------------------------------------------------------------

3u : 4u : 2u-$6

3u + 4u + 2u- $6 = $39

9u = $45

1u = $5

12u = $60

- mummyscopio
- BlueBelt
**Posts:**228**Joined:**Fri Dec 05,**Total Likes:**2

### Re: Q&A - PSLE Math

mummyscopio wrote:EC72 wrote:

Please help with this question. Thank you.

for the clear explanation mummyscopio!

### Re: Q&A - PSLE Math

mummyscopio wrote:EC72 wrote:

Please help with part b) of this question. Thank you.

Ratio of

Value of 10¢ : value of 20¢ : value of 50¢

3 : 2 : 1

(A) 3/6 = ½ of the money was in 10¢ coins.

Value of 10¢ : value of 20¢ : value of 50¢

3u : 2u : 1u

6u : 4u : 2u

-3u : : -$6(12 50¢-coins)

----------------------------------------------------------------

3u : 4u : 2u-$6

3u + 4u + 2u- $6 = $39

9u = $45

1u = $5

12u = $60

mummyscopio !

### Re: Q&A - PSLE Math

Help pls :

The average mass of a cupboard, a sofa and a few television sets was 36 kg.

When the cupboard and the sofa which weighed 41 kg and 39 kg respectively were excluded, the average mass of the television sets became 34 kg.

How many television sets were there?

The average mass of a cupboard, a sofa and a few television sets was 36 kg.

When the cupboard and the sofa which weighed 41 kg and 39 kg respectively were excluded, the average mass of the television sets became 34 kg.

How many television sets were there?

### Re: Q&A - PSLE Math

Number of TV units-> uttlkbs wrote:Help pls :

The average mass of a cupboard, a sofa and a few television sets was 36 kg.

When the cupboard and the sofa which weighed 41 kg and 39 kg respectively were excluded, the average mass of the television sets became 34 kg.

How many television sets were there?

Total mass of TVs -> 34u

Total items -> u + 2

Total mass of all items -> 34u + 41+39 = 34u+80

(34u + 80) / u+2 -> 36

34u + 80 -> 36u + 72

2u -> 8

u-> 4

**Number of TV sets is 4.**