exam Maths Puzzle Numerical Ability

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Multiply
3 sqrt a(3sqrt3a^2+3sqrt^81a^2)

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exam Other Question

The average of four numbers is 98. If three of the numbers are 86, 87, and 91, what is the fourth number? A boy rides a bike 8 miles. The trip would have taken 20 minutes less if he had ridden 2 miles per hour faster. find his actual speed.