exam Maths Puzzle Numerical Ability

A boy is 4 years old and his sister is three times as old as he is. When the boy is 12
years old, how old will his sister be?

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exam Other Question

A box contains four defective and six good electronic sensors. If five sensors are drawn, with replacement, find the probability of drawing
(a) at most one defective
(b) at least two angles are supplementary. One angle measures 30 less than twice the other. What are the measures of the angles?