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primary 6 | Maths | Ratio
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primary 6 chevron_right Maths chevron_right Ratio chevron_right Singapore

3 boys had 144 erasers together. A gave some of his erasers to B and B's erasers doubled. B then gave some of his erasers to C and C's erasers doubled. In the end, the three boys had and equal number of erasers each. How many erasers did A have?

Date Posted: 6 months ago
Views: 46
6 months ago
in the end
A: 4 u
B: 4 u
C: 4 u

b4 B to C
A: 4 u
B: 6 u
C: 2 u

at first
A: 7 u
B: 3 u
C: 2 u

12 u = 144
u = 12

at first. Alan has 7x12 = 84 erasers


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Tan Hui Lian
Tan Hui Lian's answer
9 answers (Tutor Details)
Look at the ending result and work forward to the at first amount.