exam Maths Puzzle Numerical Ability

15. Carpentry: A carpenter needs to pour a rectangular slab 28 ft. long, 16 ft. wide, and 6 in. thick. How many cubic yards of concrete does the carpenter need?

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exam Other Question

find two numbers who sum is 40, such that the square of one number plus 6times the other number is a minimum three distinct integers are chosen at random from the first 20 positive interger compute the pobabability that
a- their sum is even
b- their product is even