Question

Obi's age is twice oba's age 4 years ago obi was three times as old as oba. find their ages​

Answer 1

`8\\4`

Explanation:

Obi's age is
`x`.

Oba's age is
`2x`.

4 years ago, Obi's age was
`x-4`.

4 years after, Obi's age is
`2x-4`

3 times more than Oba's, so
`3(x-4)`

`2x - 4 = 3( x - 4)`

`2x - 4 = 3x-12`

`2x - 3x = -12+4`

`-1x=-8`

`x=8`

`x-4\\(8)-4=4`

Answer 2

Obi's age is 18 and Oba's age is 9

Explanation:

Let Obi's age be x and Oba's age be y

Condition 1:

x = 2y -----------(1)

Condition 2:

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

=> x -4 = 3y-12

=> x - 3y = -9 -----(2)

Putting eq (1) in (2)

2y - 3y = -9

=> -y = -9

=> y = 9

Now,

x = 2y

=> x = 2(9)

=> x= 18