Explanation

Let the son's age = x years

Mother's age = 5 times son's age = 5x years

Sum of their ages = 60 years

So, x + 5x = 60

6x = 60  

x = 60 / 6  

x = 10

Son's present age = 10 years

Last verified on 04-09-2026

Explanation

Let the younger brother's present age = x years

Then older brother's present age = x + 9 years

After 5 years:

Younger brother's age = x + 5

Older brother's age = x + 9 + 5 = x + 14

Sum after 5 years = 49

So, (x + 5) + (x + 14) = 49  

2x + 19 = 49  

2x = 49 - 19  

2x = 30  

x = 15

Younger brother = 15 years  

Older brother = x + 9 = 15 + 9 = 24 years

Last verified on 04-09-2026

Explanation

Given: Father's age = 5 times daughter's age = 5x years

Sum of ages = 48 years

So, x + 5x = 48

6x = 48

x = 48 / 6

x = 8

Daughter's current age = 8 years

Last verified on 03-08-2026

Explanation

Father’s current age = 72 − 6 = 66 years.

Son’s current age = 66 ÷ 6 = 11 years.

Last verified on 02-09-2026

Explanation

Use the set formula: 

Students who study CS or Math = CS + Math - Both  

= 55 + 50 - 10  

= 95 students

Students who study neither = Total students - Students who study CS or Math  

= 100 - 95  

= 5 students

Last verified on 02-09-2026