Question

Malina has to bowl four games in her league. She bowled a 149, 162, and a 152 in her first three games. She wants to have an average score of 154. What score does she need in her fourth game?
152
153
154
155

Answer 1

To solve, we add the 4 numbers (including the one unknown) and divide that total by 4, and this equals the desired overall average of 154.

x= score needed on 4th game


(149 + 162 + 152 + x)/4= 154
add in parentheses

(463 + x)/4= 154
multiply both sides by 4; 4 "cancels out" on the left side

463 + x= 616
subtract 463 from both sides

x= 153


ANSWER: 153 is the score needed on the 4th game to reach the desired overall average of 154.

Hope this helps! :)