AC Lim's answer to Mike's Primary 5 Maths Fractions Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
AC Lim
Ac Lim's answer
2986 answers (A Helpful Person)
1st
Hope this help
Mike
Mike
4 months ago
May i know why need times 3?
AC Lim
AC Lim
4 months ago
We need to eliminate either cake or pie, in this case, cake have more u. i.e 6u, so we choose to eliminate the pie. 3u, therefore we able to find cake 1u.

Total
Cake =6u
Pie=3u

Given 1cake and 1pie=80
3 cake + 3 pie = 240 (all time 3)

Total cake and pie = 300
3 cake + 3 cake +3 pie = 300
3 cake + ( 240) = 300 —-> 240 = 3cake +3pie

....
.... 1cake=20
Mike
Mike
4 months ago
Got it. Thank u so much.