Question

product of rohan's age 5years ago and 4 years hence is numerically 360.find his present age

Answer 1

Answer:

Let Rohan present age be x years.

According to statement

(x - 5)(x + 4) = 360

${x}^{2} - x - 20 = 360 \\ {x}^{2} - x - 380 = 0 \\ {x }^{2} - 20x + 19x - 380 = 0$

x(x - 20) + 19(x - 20) = 0

(x - 20)(x + 19) = 0

x = 20 or x = - 19 rejected

so Rohan present age = 20 years