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Question
Primary 4 | Maths
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before
sg stamps: 2u
my stamps: 486-2u
after
sg stamps: u
my stamps: 486-2u+63 = 549-2u
u = 549-2u
u = 183
at first, 183x2 = 366 sg stamps.
***
factors of 15 are 1, 3, 5 & 15
sum = 1+3+5+15 = 24
multiples of 8 are:
8, 16, 24, ...
so the no. is 8.
...
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