book Maths Puzzle Numerical Ability

i am less than 100
The sume of my digits is 4
half of me is an odd number

What number am i?

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book Other Question

A rectangle has an area of 53.3 square feet. If the rectangle is 8.2 in. long, how wide is it? Hello, here is my problem:
(U^6 + V^6 + 2U^3V^3) / (U^3 -V^3 + U^2V �UV^2)
The answer is= (U^2-UV+V^2)^2 / (U-V)
I have been working on it for about three hours, I just need the steps to help me figure it out. Please and Thanks!