Riddle: A mother is 55 years old . she has 3 daughters. the first one is 15 years. the second one is 7 year and the third one is 21 year. in how many years will the mother ages be qual to the sum of her daughter ages?

The answer: Riddles have always been a popular form of brain training fun.

You may be seen the “A mother is 55 years old” a riddle on the Internet or on social media and have been struggling with its answer for a while.

#### A mother is 55 years old Riddle

This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities.

The answer to the A mother is 55 years old riddle is below.

Let mother’s age: m = 55

Daughter 1: a = 15

Daughter 2: b = 7

Daughter 3: c = 21

Let x is the number of years where the sum of the 3 daughter’s ages will equal to the age of their mother.

(a+x) + (b+x) + (c+x) = m + x

(15+x) + (7+x) + (21+x) = 55+x

43 + 3x = 55 + x

3x – x = 55 – 43

2x = 12

x =12/2

x = 6

Therefore

Daughter 1: a+x = 15 + 6 = 21

Daughter 2: b+x = 7 + 6 = 13

Daughter 3: c+x = 21 + 6 = 27

Sum of 3 daughter’s ages

= 21 + 13 + 27

= 61

Mother’s age = m + x = 55 + 6

=61