Question 583975
marika's age = 8 years

Father's age 4*8=32 years

let him be 3 times her age after x years 

Marika's age after x years 8+x
Father's age after x years  32+x

32+x=3(8+x)

32+x=24+3x

3x-x=32-24

2x=8

/2
x=4

after 4 years