exam Maths Puzzle Numerical Ability

Find the volume of a pyramid with height 18 feet and a base area of 81 square.

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exam Other Question

provide me the solution please
If two dices are rolled,find the probability that

1). two faces shows same number.
2). the sum of the two faces are greater than 1.
3). sum is atleast 9.
4). sum is odd.
5). sum is almost 3.

How much pure alcohol must be added to 40 oz of a 25%
solution to produce a mixture that is 40% alcohol?