exam Maths Puzzle Numerical Ability

i need help to understand these problems the steps they are odd problems therefore the answers are in the back but i do not understand how to get to them.

directions: sketch the

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exam Other Question

I have a question about how you simplify fractions with variables. Here is a problem with its solution. Why is the answer not simplified into a mixed number?
3 over 10q plus 9 over 10 q equals 6 over 5 q?
Simplify: (625)^1/2