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Mathematics

The sum of the ages of Vivek and his youger brother Amit is 47 years. The product of their ages in years is 550. Find their ages.

Quadratic Equations

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Answer

Let the age of Vivek be x years.

Since sum of ages of vivek and amit is 47, so amit's age = (47 - x) years

Product of ages = 550

∴ x(47 - x) = 550

47xx2=550x247x+550=0x225x22x+550=0x(x25)22(x25)=0(x22)(x25)=0x22=0 or x25=0x=22 or x=25.\Rightarrow 47x - x^2 = 550 \\[1em] \Rightarrow x^2 - 47x + 550 = 0 \\[1em] \Rightarrow x^2 - 25x - 22x + 550 = 0 \\[1em] \Rightarrow x(x - 25) - 22(x - 25) = 0 \\[1em] \Rightarrow (x - 22)(x - 25) = 0 \\[1em] \Rightarrow x - 22 = 0 \text{ or } x - 25 = 0 \\[1em] x = 22 \text{ or } x = 25.

Vivek's age = 25 years and Amit's age = 22 years.

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