Question

Raymond plans on playing 5 rounds of golf while on vacation. He wants his average to be 90 or less. His scores for the first 4 rounds were 87, 94, 89, and 89. What does he need to score on the last round to make it goal?

Answer 1

91 or less

Explanation:

Raymond's scores for the first 4 rounds were 87, 94, 89, and 89.

He wants his average to be 90 or less.

Let the score on his last round = x

Then:

`(87+94+89+89+x)/(5)\leq90`

We solve for x:

`\begin{gathered} (359+x)/(5)\leq90 \\ \text{ Multiply both sides by 5} \\ (359+x)/(5)*5\leq90*5 \\ 359+x\leq450\text{ } \\ \text{ Subtract 359 from both sides} \\ 359-359+x\leq450-359 \\ x\leq91 \end{gathered}`

He needs to score 91 or less to make his average to be 90 or less.