## Q&A - PSLE Math

- ninjamathtv
- YellowBelt
**Posts:**15**Joined:**Thu May 19,

### Re: Q&A - PSLE Math

This question seems confusing, but once you draw bar models, it becomes easy to understand. This video shows a step by step solution using bar models.doraemo wrote:please help :

1) The ratio of the number of marbles May, Teddy and Sam had was 3:5:2. During a game, May lost half of her marbles to Teddy. Teddy lost 20 marbles to Sam who then had 3 times the number of marbles May had at the end of the game.

a) What was the percentage increase in the number of marbles Sam had at the end of the game?

b) How many marbles did Teddy have at the end of the game?

[/youtube]

### Re: Q&A - PSLE Math

(a) M : Fdoraemo wrote:

2) At a fun-raising event, 60% of the people were male and the rest were female. 20% of the female left the event in the afternoon.

In the evening, after 33 male and 35 female left the event, 75% of the people at the event were male.

a) What percentage of the people left the event in the afternoon?

b) How many people were there at the start of the fun raising event?

----6u: 4u

0.2x4u = 0.8u

0.8u/10u X 100 =

**8%**

(b) M : F

6u-33 : 3.2u-35 (where 3.2u=4u-0.8u)

6u-33 = 0.75[6y-33+3.2u-35]

6u-33 = 0.75[9.2u -68]

6u-33 = 6.9u - 51

0.9u = 18

u= 20

**Hence people at the start of event is 10u = 10 x 20 = 200**

### Re: Q&A - PSLE Math

Hi Parents,

There is an easy trick to teach your child when it comes to word problems. You can ask them to draw brackets for each sentence. This because most children cannot comprehend long wordy text. By breaking down into parts, they will be able to comprehend the content better.

We hope it helps!

There is an easy trick to teach your child when it comes to word problems. You can ask them to draw brackets for each sentence. This because most children cannot comprehend long wordy text. By breaking down into parts, they will be able to comprehend the content better.

We hope it helps!

- ninjamathtv
- YellowBelt
**Posts:**15**Joined:**Thu May 19,

### Re: Q&A - PSLE Math

Using the bar model method to solve this question. Watch the step by step video below:ozora wrote:Need some guide on the following questions

Thanks

[/youtube]

- forestcadee
- GreenBelt
**Posts:**162**Joined:**Thu Jun 24,

### Re: Q&A - PSLE Math

Hi, I would like to confirm which will be the answer if the question ask

"how many boys and girls are there in the class?"

1) Give the answer for boys and girls separately.

OR

2) Give the answer in total.

Thanks.

"how many boys and girls are there in the class?"

1) Give the answer for boys and girls separately.

OR

2) Give the answer in total.

Thanks.

- speedmaths.com
- BrownBelt
**Posts:**559**Joined:**Mon Oct 12,**Total Likes:**3

### Re: Q&A - PSLE Math

Sh beforestcadee wrote:Hi, I would like to confirm which will be the answer if the question ask

"how many boys and girls are there in the class?"

1) Give the answer for boys and girls separately.

OR

2) Give the answer in total.

Thanks.

2) Total.

### Re: Q&A - PSLE Math

Pls help. Thanks.

Faith has 2 tanks, A and B of different capacities. If tank A is filled by a tap at a rate of 3 litres per minute and tank B is filled by a tap at a rate of 5 litres per minute, when tank A is completely filled, 5 litres of water flowed out from tank B.

If tank A is filled by a tap at a rate of 4 litres per minute and tank B is filled by a tap at a rate of 3 litres per minute, when tank A is completely filled, tank B is only half-filled. What is the capacity of tank B?

Faith has 2 tanks, A and B of different capacities. If tank A is filled by a tap at a rate of 3 litres per minute and tank B is filled by a tap at a rate of 5 litres per minute, when tank A is completely filled, 5 litres of water flowed out from tank B.

If tank A is filled by a tap at a rate of 4 litres per minute and tank B is filled by a tap at a rate of 3 litres per minute, when tank A is completely filled, tank B is only half-filled. What is the capacity of tank B?

### Re: Q&A - PSLE Math

deon629 wrote:Pls help. Thanks.

Faith has 2 tanks, A and B of different capacities. If tank A is filled by a tap at a rate of 3 litres per minute and tank B is filled by a tap at a rate of 5 litres per minute, when tank A is completely filled, 5 litres of water flowed out from tank B.

If tank A is filled by a tap at a rate of 4 litres per minute and tank B is filled by a tap at a rate of 3 litres per minute, when tank A is completely filled, tank B is only half-filled. What is the capacity of tank B?

-----------Tank A vol-----Tank B vol

Case 1-------3u-----------5(u-1)

Case 2-------4p-----------3p x2

3u=4p => p=3/4u

5 (u-1) = 3p x 2

5u - 5 = 3(3/4u) x 2

10u - 10 = 9u

u = 10

**Tank B vol = 5(10-1) = 45 litres**

### Re: Q&A - PSLE Math

sushi88 wrote:deon629 wrote:Pls help. Thanks.

Faith has 2 tanks, A and B of different capacities. If tank A is filled by a tap at a rate of 3 litres per minute and tank B is filled by a tap at a rate of 5 litres per minute, when tank A is completely filled, 5 litres of water flowed out from tank B.

If tank A is filled by a tap at a rate of 4 litres per minute and tank B is filled by a tap at a rate of 3 litres per minute, when tank A is completely filled, tank B is only half-filled. What is the capacity of tank B?

-----------Tank A vol-----Tank B vol

Case 1-------3u-----------5(u-1)

Case 2-------4p-----------3p x2

3u=4p => p=3/4u

5 (u-1) = 3p x 2

5u - 5 = 3(3/4u) x 2

10u - 10 = 9u

u = 10

Tank B vol = 5(10-1) = 45 litres