Only <span>first and second place runners:
</span>11*10=110 ways
Hope that helped.
The percentage of reduction is 17%
<u>Explanation:</u>
Original price = $21
Reduced price = $17.43
Percentage of reduction = ?
Difference in price = $21 - $17.43
= $3.57
Percentage of reduction = 

Therefore, percentage of reduction is 17%
The answer is 9 because you solve it from left to right and 3x5 equals 15, 15 subtracted by 6 equals 9