Q&A - PSLE Math

[BigDevil]

1) A farmer had some geese and ducks.
If he bought another 40 ducks, the ratio of the number of ducks to the number of geese would become 5:6.
If he bought another 60 geese instead, then the ratio of the number of ducks to the number of geese would become 2:3.
How many more geese than ducks did the farmer have?

Answer here

[SOS mum]

Thank you very much, Big Devil
Didnt know tt those qns were posted earlier..Appreciate greatly and God Bless:)

[BigDevil]

You are welcome, SOS mum.

Most of the tougher questions from earlier papers
have already been answered. You can always do a
search with some of the keywords to get quick answers.

[questionable_i]

Can anyone help me with this question. Thank you.
http://i.imgur.com/itWcrNI.jpg

[Ender]

Can anyone help me with this question. Thank you.
http://i.imgur.com/itWcrNI.jpg

Using AB as the base of the triangle ABC., the height of the triangle ABC will be 4cm.
AB = 5cm

Your can find triangle ABC with the above information of base and height.

Shaded area is half of triangle ABC.

[ksraja69]

4 men and 4 women are to be seated at round table for dinner.If the men and women take alternate seats, how many arrangements are possible?

[Ender]

4 men and 4 women are to be seated at round table for dinner.If the men and women take alternate seats, how many arrangements are possible?

So there are 8 chairs.
Chair 1: 8 possible combinations. Any of the men and women can take this chair.
Chair 2: 4 possible combinations. Has to be opposite gender of person taking chair 1
Chair 3: 3 possible combinations. Has to be same gender as chair 1, and now left only 3 choices.
Chair 4: 3 possible combinations. Has to be same gender as chair 2, and now left with 3 choices.
Chair 5: 2 possible combinations. Has to be same gender as chair 1 and 3, now left with 2 choices
Chair 6: 2 possible combinations. Has to be same gender as chair 2 and 4, now left with 2 choices
Chair 7: 1 choice, has to be same gender as chair 1, 3, 5
Chair 8: 1 choice, has to be same gender as chair 2, 4, 6

Total possible combination 8 X 4 X 3 X 3 X 2 X 2 X 1 X 1 = 1152

[ozora]

Need some guide on the following questions

Thanks

[Ender]

vvv
A: 1702339
Subject: Math
Level: P6
Tags: Ratio, Fraction, u
Source:
^^^
Let male be 5u and female be 3u at noon

After 10 minutes, 1/5 of male (1u) and 1/2 of female(1.5u) left
male =4u
female = 1.5u

Total number of people during the 10 minutes after noon.
Total = 121 - 23 - 32 = 66

4u + 1.5u =66
u= 12

Total people at noon time = 5u + 3u = 8u = 96#

Edit note: Amendment in red as pointed out by BigDevil.

[Fly2high]

Hi pls help on the below

There are 8 more adults in swimming class A than swimming class B . If 8 men leave swimming class A, 1/3 of the adults
In swimming class A will be men . If 10 women leave swimming class B , the ratio of men to women in swimming class B
Will become 2:3 . Given that the ratio of the total number of men to women in both swimming
Classes is 3:5, how many adults are there in swimming class A ?

Thanks very much !
Fly2high