exam Maths Puzzle Numerical Ability

need help solving this equation

-12-7=y/3

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exam Other Question

Word problem #1
Need to make at least 12 heat and at least 20 radar missiles per month.
Production limits number of missiles to no more than 72 per month
Will sell the heat miss
Simplify the expression. please help explain how to get the answer? it was a multiple choice question, thanks!

(x^4)(x^2/3)/x


A.) x^3/40 B.) x^13/40 C.)x^11/3 D.) x^11/20