initial Common factor Final 2:3 8:12 8:12 1:3 5:15 20:60 a 8:60 = 2:15 b Currently there are 28u of M and 72u of F For female to be 90%, Male will have to be 10%, meaning that only 8 units of males are left. This means 20u of male left. 20u = 285 1u = 14.25 Difference in males = 8 vs 20 = 12u Hence, 12*14.25 = 171 more males from Westland

Thks

How do you get 20:60

Since 4 times more, I multiplied 5:15 by 4

Thanks

Try using units and parts method

Similar to this problem posted yesterday, just different context.

Another method

I used algebra to solve but idk how to explain to the students how I gotten the number of coins 😅😅

Hi Raymond, can you explain yours? Cause I don't know how to explain from your working 😪😪 sorry!

Actually, if can use algebra, I agree it would be easiest ☺ I was just trying to offer an algebra-free way.

Cause it's P5 student work, so can't use algebra uh 😅

First, I assumed no $1 coin, 49 50cent coins. Then the difference worked out to be -$24.50. Then, I increased both by 1 coin each, difference now becomes $0.50 less. So, to accumulate a difference of $4.50, ie increase by $29, I need to top up both coins by $29 ÷ $0.50 = 58, then we would get the number of coins of each type. The rest is straightforward.

I never say can't. In fact, I encourage students to use algebra for such cases whenever they can use a calculator. The reason is the calculator can solve the 2 eqns, so at least they will know in advance the answer prior to working it out ie "cheating" officially ☺

Thank you!! I think the last time when I used algebra to explain to them, when they applied to their worksheet, went to school and got scolded 😞

Thank you Kim! :)

thanx, adrian. Arlene Tan

You're welcome. Different method suits different pupil...

Chick 5, rabbit 13

pls feel free to omit wordings when presenting answer.

Excellent thx ...

Which level of the questions?

P3

Vera ... We can't assume all chicks for this question right?!

hi Xin Yi, sorry.. v messy. but thot amending the original is easier for u to see the difference.