Age problem involving quadratic equations with answers?

in quadratic equation it must be in standard form, ax^2 + bx + c = 0.

Jenny is five years older than Marian. In three years, the product of her age and Marian's age five years ago will be 90 years. Find their present age.

Solution:

Let x= Marian's present age

x + 5= Jenny's present age

The working