book Maths Puzzle Numerical Ability

By considering factors, find the smallest value of x such that 120x will be a perfect square.

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book Other Question

im trying to solve for varibles in a matrice:

[3x 4y] = [27 -16]
-48 49 -3w 7z Cynthia invested three times as much money at 6% as at 5%. If the total simple interest for one year is $1150, how much has Cynthia invested at 5%?