Question

A‘s age is 120% of what it was 15 years ago, but 75 % of what it will be after 15 years. What is his present age?

Answer 1

Answer:

present age 15 years

Step-by-step explanation:

let the present age be x

15years age=x-15

present age=(x-15)×120%

=(x-15)×120/100

=6x/5-18. -1

15after age=x+15

present age=(x+15)×75%

=3x/4+45/4. -2

from eq. 1 and 2

6x/5-18=3x/4-45/4

6x/5-3x/4=18-45/4

24x/20-15x/20=72/4-45/4

9x/20=27/4

x=27/4×20/9

x=15