book Maths Puzzle Numerical Ability

In any triangle, the sum of the measures of the angles is 180 degrees. In triangle ABC, angle A is three times as large as angle B and also 16 degress larger thans angle c. Find the measure of each angle.

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book Other Question

in substitution how do you solve for a equation for x. then solve it for y?
example 3x-5y=12
the gym is 21 years newer than the auditorium. the gym is also 1/4 as old as the auditorium. how old is each building?