you have 70% of the pages accounted for. So, if there are 30% left, then
.30*360 = 108
A mathematics book has 360 pages, of which 50% are on ALgebra, 20% on Geometry and the remainder on Arithmetic. How many pages of arithmetic are there in the book?
I'm seeing that the answer is 108 pages but I can't understand how to arrive at that answer.
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