Answer:

40 years old

Step-by-step explanation:

Let airi's present age is  x  years

Then her mother's present age is  4 x  years

After 5 years , airi's age will be  x + 5  years

After 5 years , her mother's age will be  4 x + 5  years  

By given condition 4 x + 5 = 3 ( x 5 ) or  4 x − 3 x = 15 − 5  or  x = 10 ; 4 x = 4 ⋅ 10 = 40 .

Therefore, airi's present age is  10  years and her mother's present age is  40 years.