exam Maths Puzzle Numerical Ability

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?

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exam Other Question

I need help to perform the indicated operation

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

I need to find (f og)(x) find three consecutive integers such that the sum of the first two is equeal to 3 more than the third

so i got x+(x+2)=3x+9 and simplified to get x=-7 but i don't know which dir