exam Maths Puzzle Numerical Ability

Hi. May I have some help with this equation?

(16/30)s + (16/35)s + (16/20)*s = 17

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exam Other Question

if f(x) =5x-1 find the following.
f(a-2) the angles of the triangle are abc. angle b is twice as angle a. angle c is 12 times as angle b. what are the measures of all angles?

angle abc = 180