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

Answer:

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

Step-by-step 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

Answer 2

Answer:

$8\\4$

Step-by-step 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 $3(x-4)$

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

$2x - 4 = 3x-12$

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

$-1x=-8$

$x=8$

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