book Maths Puzzle Numerical Ability

This is another problem where it says to simplify.

4x to 4th y to 7th z to 3rd/32x to 5th y to 4th z to 9th

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book Other Question

Please help me solve this:

2b+a=11
a-b=5 Suppose the interior angles of a convex pentagon are five consecutive numbers, find the measure of the largest angle.