Three numbers are in ratio 5:6:7. If the sum of the squares of those three numbers is 440 then find the sum of the three numbers.
A : B : C = 5x : 6x : 7x A2+ B2+ C2= 25x2+ 36x2+ 49x2= 110x2 => 110x2= 440 => x = 2 => A + B + C = 5x + 6x + 7x = 18x = 18 ×2 = 36
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