Question

The product of neelmani age 5 years ago and 8years ago is 40. find neelmani present age.

Answer 1

let her present age be x
Acc. to que.
(x-5)(x-8) = 40
${x}^{2} - 8x - 5x + 40 = 40 \\ {x}^{2} - 13x + 40 - 40 = 0 \\ {x}^{2} - 13x = 0 \\ x(x - 13) = 0 \\ x - 13 = 0 \\ x = 13$
therfore her present age is 13 years.

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