Question

My bowling average for four games was 160.

Two of my games were 155 and 169.
What was the average of my other two games?

Answer 1

Explanation:

The average of 4 games was 160. The average consists of the sum of all the scores, divided by 4:

(Sum of Games)/4

Sum of 2 games is (155 + 169) = 324

Lets let the sum of the two unknown games be x.

(234 + x)/4 = 160

(234 + x) = 640

x = 316

x consists of 2 games, so their average is (316/2) = 158 per game for the other 2 games.

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Check:

(155+169+158+158)/4

(640/4) = 160 average for all games.