book Maths Puzzle Numerical Ability

9/2b+1=c. which is NOT a value of b?

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

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book Other Question

$700 simple interest was earned over 4 years on an investment of $2500. What was the annual rate? simplify the following:
(x+y/x^3-x^2)/(x^2+y^2/x^2-x)
answer:
a. 1/x+y
b. -x
c. x(x^2+y^2)/x+y
d. x+y/x(x^2+y^2)
e. none of the above