Medium
Five years ago, the sum of the ages of Balu, Baby and Rani was 78. What is the sum of their ages after five years?
Explanation
Explanation
Since there are 3 people, in the 10 years spanning from 'five years ago' to 'five years from now', each person's age increases by 10, adding 3x10=30 to the total. So sum after five years = 78+30 = 108.
PRO TIP
Re-check your working by substituting the answer back into the original question.