The average age of a family with 5 members is 28. If one members of age 20 years is excluded the average age of the family becomes :
Answer & explanation
Correct answer: option 3
Let sum of ages of 5 be x
Here,
x = 28 × 5
x =140
New average age of remaining four = \(\frac{140\;-\;20}{4}\) = 30