exam Maths Puzzle Numerical Ability

modified problem instead of volume I was tryng surface area for some notes for a test

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1. If the lenght of a rectangle is doubled, does the area double? Why or why not?

2. If the height and the base of a triangle are doubled, what happens to the area? Explain. A small town library buys a total of 35 books that cost $1022. Some of the books cost $22 each, and the remainder cost $34 per book. How many books of each price did the library b