exam Maths Puzzle Numerical Ability

carry out the indicated operation
(x - root sign 7)(x-root sign 7)

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exam Other Question

The Rileys have $27,000 to invest. they intend to invest part of the money in certificates of deposit at 8.5% and the remainder in a savings account at 5%. If they wish to receive the same income from each investment, how much should they invest in each? Ten less than the quotient of n and the difference between n and six.