Answer is D.
When you have an exponent that is a fraction, the denominator is the number you root the base by. In this case the exponent is 3/5, so you fifth root 13 cubed.
I think it's another trick question and the answer is 2000.
If he fills 5.9 bags for 18 hours, he will have filled a total of 106.2 bags
<span>h = Williams hours
h + 2.5 = Jose's hours because he worked 2.5 hours more than William, so you add 2.5 to William's hours (which is represented by h) to get Jose's hours
then you add them together..</span><span>
</span>