"A" can solve 90% of the questions in a book and "B" can solve 70% of them.
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The volume of rectangular prism is the product of its length, width and height.
So the volume V of prism with length
yards, width 
yards and height of 4 yards will be:
Thus the volume of prism as a mixed number in simplest form will be
cubic yards
So the volume V of prism with length
Thus the volume of prism as a mixed number in simplest form will be