book Maths Puzzle Numerical Ability

have three problems that i am really stuck on and I don't even know where to begin

I HAVE 3 PROBLEMS THAT I AM CLUELESS ON HOW TO ANSWER. HERE THEY ARE

1) IF f(X)=3/8X SQU

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book Other Question
Multiply

10
7 x



.

4
7x find three consecutive odd integers such that four times the sum of the first and third integer is five more than the product of three and the second interger