Question

After five games of bowling, Ralph’s average score was 91. After six games, his average score was 89. What was his score in the sixth game

Answer 1

His score was 79 in the sixth game

Answer 2

79

Explanation:

We require his total score after 5 games

average =
`(total)/(count)`, hence

`(total)/(5)` = 91 ( multiply both sides by 5 )

total = 5 × 91 = 455

let his score in the sixth game be x, then

`(455+x)/(6)` = 89 ( multiply both sides by 6 )

455 + x = 534 ( subtract 455 from both sides )

x = 534 - 455 = 79

his score in the sixth game was 79