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Anita's pens: she paid Rs 720; Rs 2 cheaper would give 4 more pens. How many pens did she actually buy?

Class 10Quadratic Word ProblemsAlgebra — Quadratics

A32
B36
C40
D72

Step-by-Step Solution

\frac{720}{x} - \frac{720}{x + 4} = 2, \frac{720 ( 4 )}{x ( x + 4 )} = 2, x^{2} + 4 x - 1440 = 0, (x + 40) (x - 36) = 0. x = 36

pens.

Answer: B) 36

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