exam Maths Puzzle Numerical Ability

n(a)=12

n(BUC)=38

n(c')=9

n(A'UC')=16

AUBUC=U
A'UB'={u,e,a}

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exam Other Question

Triangle ADE ~ triangle ABC

Given: DE = 5, AD = 8, DB = BC
Find: AB
(Hint: Find DB first.)

I need help with the hint. I know that I need to some how set up a proportion triangle EFG is an isosceles triangle with EF= FG. if m<E= 4x+50, m<F= 2x+60, and m<G= 14x+30, find m<G.