exam Maths Puzzle Numerical Ability

Jay flew an airplane 500km against the wind in the same time it took him to fly it 600km with the wind. The speed of the wind was 20km/h. What was the average speed of the airplane?

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exam Other Question

The operation @ is defined as @(a) = a^2 + 4a -4, for any real number a. Find the value(s) of a for which @(a)= a. What is the probability of drawing a yellow marble or a red marble from a bag containing 12 yellow marbles, 16 red marbles, and 15 green marbles?