book Maths Puzzle Numerical Ability

I need to solve the formula in terms of the given variable ad = f;a

I have no idea what to do, please help!

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book Other Question

Given f(x)=4x+1 and g(x)=x^2+1

Find: (f o g)(x)=

my answer was 4x^2+4 was I correct? one number is 5 times another number the sum of the two numbers is 270 what is the number