Multiple choice

The average weight of $3$ persons is $65$kg. If a fourth person having a weight of $45$kg joins the group, then what is the average weight of the group?

  1. $65$ kg
  2. $63$ kg
  3. $61$ kg
  4. $60$ kg
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial sum of weights = 3 * 65 = 195. New sum = 195 + 45 = 240. New average = 240 / 4 = 60.

AI explanation

Using the basic average formula, the total weight of the first 3 persons is 3 times 65, which equals 195 kg. When the fourth person joins, the new total weight becomes 195 plus 45, giving 240 kg. The average weight of all 4 persons is 240 divided by 4, which equals 60 kg.

Keep practicing — related questions