Question

In three bowling games,David scored 139,143, and 144. What score will David need in the fourth game in order to have an average score of 145 for all 4 games
Please explain how

Answer 1

Let's find out.

David needs to score an average of 145 across all four games, so first we do:

145 × 4 = 580

Then we add all the scores he currently has: 

139 + 143 + 144 = 426

Then we subtract 426 from 580 to find out how much he needs to score for his fourth:

580 - 426 = 154

David needs to score 154 on his 4th game to have an average score of 145 for all 4 games.