exam Maths Puzzle Numerical Ability

I need help to perform the indicated operation

f(x)=5x+15, g(x)=3x-1

I need to find (f og)(x)

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exam Other Question

Find the cost per pound of a trail mix made from 10 lb of raisins that costs $4.20 per pound and 90 lb of granola that costs $5.60 per pound.

A. $4.32
B. $5.46
C. $6.07
D. $6.83 Emilio and Rose sell half of their book collection at a garage sale. They donate 1/5 of the remaining books to a resale shop and keep 40 books. How many books did they have to start with?