book Maths Puzzle Numerical Ability

$700 simple interest was earned over 4 years on an investment of $2500. What was the annual rate?

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book Other Question

I need help with a question, Find the value of a in the equation

5
--- =
a+3

3
---
a-2


I think the answer is a= 2 3/8

Am I right, Can someone let me know?
9/2b+1=c. which is NOT a value of b?

a) 1
b)1/2
c)-1/2
d)0