exam Maths Puzzle Numerical Ability

the sum of the digits of a two-digit nimber is 12. the value of the number is five more than 10 times the tens digit. find the number

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Find the area of a regular hexagon with side 2(square root)3cm and apothem 3 cm. Solve.

The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the