If 30% of John's photographs were perfect, but 210 photographs were not perfect, then how many photographs were there in all?
1 answer:
If 30% were perfect, 70% were not perfect. So we know that 70% of the total number of photographs is 210.
p(70/100)=210 multiply both sides by 100
70p=21000 divide both sides by 70
p=300
So there are 300 photographs in all.
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