book Maths Puzzle Numerical Ability

Hi! Mathematicians..i hope you can help me solve the following problems with solutions so i can review the answers. thanks!

18) How many square kilometers is a rectangular fie

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book Other Question

Bill gave one-third of his jellybeans to a friend, ate two-thirds of the remaining jellybeans, and had eight jellybeans left over. How many jellybeans did Bill have originally? (3+square root of -5)times(7-(square root of -10)