each gift =$10
total=y
number of gifts =x
therefore,total= each gift * number of gifts
=$10* x
Answer:
b
Step-by-step explanation:
The formula is
time = (Worker 1 * Worker 2) / (Worker 1 + Worker 2)
time = (18 * 20) / (18 + 20)
time = 360 / 38
time =
<span>
<span>
<span>
9.4736842105
</span>
</span>
</span>
minutes
So, the answer is "a. 9.5 minutes".
Source
http://www.1728.org/work.htm
