Question

Jacob present age is 4/5 times of david age four years ago jacob age was 3/4 times of david find their present age

Answer 1

Answer:

Jacob age = x = 16 years

David age = y = 20 years

Step-by-step explanation:

let Jacob age be x

David age be y

present age of Jacob is 4/5 times of David age

x = 4/5 y

before 4 years Jacob was 3/4 times of David age

x - 4 = 3/4 (y - 4)

4(x -4) = 3(y - 4)

4x - 16 = 3y - 12

4x - 3y = - 12 + 16

4x - 3y = 4

4(4y/5) - 3y = 4

16y/5 - 3y = 4

(16y - 15y)/5 = 4

y/5 = 4

y = 4 × 5

y = 20

x = 4/5 y

x = 4/5 × 20

x = 4 × 4

x = 16

Jacob age = x = 16 years

David age = y = 20 years

hope you get your answer