exam Maths Puzzle Numerical Ability

A plumber needs 3 times as much solid pipe as perforated pipe to lay a drain line 200 feet long. How much solid pipe is needed?

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exam Other Question

If planes a and b are distinct planes having points x,y,and z in common, what conclusion can you make about points x,y, and z?

Why?
find a slope of (3,6) and (2,5)