Question

The sum of the present ages of Ravi and Kishan is 69 years. If 8 years ago, Ravi's age was four years less than double the age of Kishan. Find the difference between their present ages (in years).
For class 7 without double variable

Answer 1

Step-by-step explanation:

let Ravi is x years old now

so kishan is (69-x) years old now

8 years ago,Ravi was (x-8)years and kishan was (69-x-8)years

so,

x-8=2(69-x-8)-4

x-8=2(61-x)-4

x-8=122-2x-4

x+2x=122-4+8

3x=126

x=126/3=42

so Ravi is now 42 years old and Kishan is now (69-42)years =27 years old

so the difference between their present ages is (42-27)years=15 years