book Maths Puzzle Numerical Ability

If three-fourths of a man's age is 36 years,how old is he?

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book Other Question

Use the distributive property to simplify: 98*7.
Instructor shows answer as 700-14=686.
How? Why? If f(x)=x^2-3x+5, find f(1)-f(4)
Please help me, i've tried and i just don't understand how to slove this, thanks so much.