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Common difference between ages = (4/2) = 2 years. So, let present ages of ‘A’, ‘B’, ‘C’ and ‘D’ be ‘x’, (x + 2) years, (x + 4) years and (x + 6) years, respectively According to question: x + x + 2 + x + 4 + x + 6 = 200 Or, 4x = 188 Or, x = 47 years (Age of A) Present age of ‘C’ = x + 4 = 47 + 4 = 51 years Required sum = 47 + 51 = 98 years
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If X + Y = 23 and XY = 126, what is the value of (X)² + (Y)² ?