## Q&A - PSLE Math

### Re: Q&A - PSLE Math

Thank lynntan.

Thank Ice watch. Your model for Q18 is so impressive but it looks confuse to me. Thank for your help..

Thank Ice watch. Your model for Q18 is so impressive but it looks confuse to me. Thank for your help..

- alfretztay
- KiasuGrandMaster
**Posts:**1199**Joined:**Sun Sep 12,**Total Likes:**5

### Re: Q&A - PSLE Math

Daddy wrote:Hi alfretztay Thank.

I still not understand what you meant "Cross multiply to make the two sides equal."

5[(1u - 13) + (1u - 43)] = 2(1u + 56)

Sorry, I am slow. Can you explain further?

**:**

*J + M*

*C*2 : 5

(1u - 13) + (1u - 43) : 1u +56

From the above two ratios,

2/(1u - 13) + (1u - 43) = 5/1u + 56

Hence, 2(1u + 56) = 5[(1u - 13) + (1u - 43)].

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

### Re: Q&A - PSLE Math

Hi,Daddy wrote:Hi.

Please help on these 2 questions. Thank.

Thank..

Let’s try

**another possible**solution:

**At first**:

Ratio of [Jon and Molly] : [Chris] → 2:5 →

**6:15**(Total is 21 Boxes)

(You may use 21 Boxes, or 21 units or 21 u)

**Finally**:

Ratio of [Jon] : [Molly] : [Chris] →

**7:7:7**(Total is 21 Boxes)

Slide 1:

Slide 2:

Slide 3:

Changes (for

**Chris**):

8 Boxes → 25 + 31 = 56 (sweets)

1 Box → 7 (sweets)

7 Boxes → 49 (sweets).......................[Finally, for all 3]

**Jon**:

49 + 12 - 25 =

**36 sweets (at first)**

Slide 4:

Hope this helps

Cheers

**SpeedMaths**

.

### Re: Q&A - PSLE Math

Ken invited 36 more women than men to his wedding. 1/4 of the women and 3/8 of the men, totaling to 79 didn't turn up. How many women were invited?

- alfretztay
- KiasuGrandMaster
**Posts:**1199**Joined:**Sun Sep 12,**Total Likes:**5

### Re: Q&A - PSLE Math

3u + 2u + 9 = 79reiner wrote:Ken invited 36 more women than men to his wedding. 1/4 of the women and 3/8 of the men, totaling to 79 didn't turn up. How many women were invited?

5u -> 70

1u -> 14

8u -> 112

112 + 36 = 148

Ans : 148 women.

### Re: Q&A - PSLE Math

thanks... alfretztay...

3u + 2u + 9 = 79.... what is this "9" eh??

> 3u is from 3/8

> 2u is from 1/4 (2/8)

correct??

3u + 2u + 9 = 79.... what is this "9" eh??

> 3u is from 3/8

> 2u is from 1/4 (2/8)

correct??

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

### Re: Q&A - PSLE Math

Hi,reiner wrote:thanks... alfretztay...

3u + 2u + 9 = 79.... what is this "9" eh??

> 3u is from 3/8

> 2u is from 1/4 (2/8)

correct??

9 would be 1/4 of 36.

Cheers

SpeedMaths

.

### Re: Q&A - PSLE Math

In the end, the question states the J, M, and C has equal amount. That would also implies J+M is twice of C.Daddy wrote:Thank Ender for the working and answer.

But I am not understand how did you get JM twice than C...on wards . Thanks.

### Re: Q&A - PSLE Math

For a simple and visual approach,

click on the youtube link. Cheers!

https://www.youtube.com/watch?v=MweyFt- ... e=youtu.be

click on the youtube link. Cheers!

https://www.youtube.com/watch?v=MweyFt- ... e=youtu.be