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primary 5 | Maths | Rate & Ratio
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SLXE
SLXE

primary 5 chevron_right Maths chevron_right Rate & Ratio chevron_right Singapore

Pls help, thx

Date Posted: 4 years ago
Views: 395
AC Lim
AC Lim
4 years ago
Before:
20c = 4u
50c = 1u

100 pcs of 20c = $20 = 40 pcs of 50c

After:
20c = 4u - 100
50c = 1u + 40

given, he had 38 more 50c coins
Therefore, 1u+40 - 38 = 4u-100
3u = 140-38
3u = 102
1u = 34

a) 20c coins is 4u -1u = 3u more
3u = 3 x 34 = 102 coins more.

b) 20c = 4u
=4 x 34
=136
Value = 136 x $0.20 = $27.20

50c = 1u
= 34
Value = 34 x $0.50 = $17.00

Total Ravi have = $27,20 + $17.00 = $44.20.
Hope this helps

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