Question

Damien played golf on each of the four days of his vacation. His scores on the first three days were $93,92$, and $89$, and his average for the four days was $90$. What was his score on the fourth day?

• A. $84$
• B. $85$
• C. $86$
• D. $87$
• E. $88$

Answer 1

The correct option is C $86$

Scores on of Damien on the first $3$ days are $93,92$ and $89$.
Let is score on $4^{th}$ day be $x$
His average for four days is $90$.
So, his average on $4^{th}$ day will be
$\Rightarrow \frac{93+92+89+x}{4}=90$
$\Rightarrow 274+x=360$
$\Rightarrow x=360-274$
$\Rightarrow x=86$
Average score on $4^{th}$ day is $86$.