## Q&A - PSLE Math

- 2632parent
- OrangeBelt
**Posts:**92**Joined:**Sat Apr 07,

### Re: Q&A - PSLE Math

Need help on the following question

1. Anna and Ben take 9 days to complete a jigsaw puzzle. Ben and Celine take 3 days to complete the same jigsaw puzzle. When Celine partners Dennis, they take 4 days to complete the jigsaw puzzle. How many days will Anna and Dennis take to complete 2 such jigsaw puzzles?

1. Anna and Ben take 9 days to complete a jigsaw puzzle. Ben and Celine take 3 days to complete the same jigsaw puzzle. When Celine partners Dennis, they take 4 days to complete the jigsaw puzzle. How many days will Anna and Dennis take to complete 2 such jigsaw puzzles?

### Re: Q&A - PSLE Math

Kindly please explain why 24/2 (time taken for B to complete 24 units of work) ?MathIzzzFun wrote:Workrate for A --> 1 unit/hourskvn wrote:please help to solve.

4. B and A have to paint a flat. B can paint twice as fast as A. They will take a total of 8hrs to paint the entire flat. How long will B take to paint the whole flat if he paints the house by himself ?

Workrate for B --> 2 units/hour

Total when both work together --> 3 units/hour

in 8 hours, work completed --> 8 x 3 units/hour = 24 units

time taken for B to complete 24 units of work = 24 / 2 = 12 hours.

cheers.

- acehkr3009
- OrangeBelt
**Posts:**42**Joined:**Tue Mar 24,

- acehkr3009
- OrangeBelt
**Posts:**42**Joined:**Tue Mar 24,

- acehkr3009
- OrangeBelt
**Posts:**42**Joined:**Tue Mar 24,

- danishcookies
- KiasuNewbie
**Posts:**8**Joined:**Tue Jan 17,

### Re: Q&A - PSLE Math

Pls help

Mr Lee bakes 185 more chicken pie than tuna pie. After selling 3/5 Of the chicken pie and half of the tuna pies, he had 146 pie left. How many pie did he left?

Mr Lee bakes 185 more chicken pie than tuna pie. After selling 3/5 Of the chicken pie and half of the tuna pies, he had 146 pie left. How many pie did he left?

- MathIzzzFun
- KiasuGrandMaster
**Posts:**2357**Joined:**Wed Mar 09,**Total Likes:**5

### Re: Q&A - PSLE Math

B's work rate -> 2 units/hourS-H wrote:Kindly please explain why 24/2 (time taken for B to complete 24 units of work) ?MathIzzzFun wrote:Workrate for A --> 1 unit/hourskvn wrote:please help to solve.

4. B and A have to paint a flat. B can paint twice as fast as A. They will take a total of 8hrs to paint the entire flat. How long will B take to paint the whole flat if he paints the house by himself ?

Workrate for B --> 2 units/hour

Total when both work together --> 3 units/hour

in 8 hours, work completed --> 8 x 3 units/hour = 24 units

time taken for B to complete 24 units of work = 24 / 2 = 12 hours.

cheers.

To complete 24 units of work, B will take 24 units ÷ 2 units/hour = 12 hours.

Alternatively, we can also work it this way:

Since B works twice as fast as A,

when A completed 1 flat, B would complete 2 flats over the same time--> total 3 flats.

A & B take 8h to complete 1 flat.

So, to complete 3 flats, they will take 3 x 8h = 24h

So, in 24h,

A completed 1 flat

B completed 2 flats --> 1 flat in 12 hours.

cheers.

### Re: Q&A - PSLE Math

Hi,acehkr3009 wrote:Hi all,

Will need help on finding the area of the unshaded triangle.

Thanks.

Can you find the area of triangle from here?

Regards

- MathIzzzFun
- KiasuGrandMaster
**Posts:**2357**Joined:**Wed Mar 09,**Total Likes:**5

### Re: Q&A - PSLE Math

...missing word in question ? --> How many tuna pies or chicken pies left ?danishcookies wrote:Pls help

Mr Lee bakes 185 more chicken pie than tuna pie. After selling 3/5 Of the chicken pie and half of the tuna pies, he had 146 pie left. How many pie -> chicken or tuna, did he left?

At first,

Tuna pies --> 10u

*(LCM of 5 & 2)*... 1/2 --> 5u

Chicken pies --> 10u + 185 ... 3/5 --> 6u + 111

Pies left:

Tuna pies --> 5u

Chicken pies --> 4u + 74

Total --> 146

5u + 4u + 74 --> 146

9u --> 72

1u --> 8

chicken pies left --> 4 x 8 + 74 = 106

tuna pies left --> 40

cheers.

### Re: Q&A - PSLE Math

Hi, pls help to solve this question:

In primary 6A, the average score for a math test was 71. The average score of all the girls in the class was 77 while the average score for all the boys was 63. There were 6 more girls than boys. How many pupils in the class?

TIA

In primary 6A, the average score for a math test was 71. The average score of all the girls in the class was 77 while the average score for all the boys was 63. There were 6 more girls than boys. How many pupils in the class?

TIA