I think it should be answer D) I think I think
The answer would be -141.
If it takes the cold water faucet x minutes to fill 1 tub, then its flow rate is (1 tub)/(x min).
The hot water faucet takes 4 times as long, so its flow rate is (1 tub)/(4x min).
Together, the total flow rate is (1 tub)/(3 min), so we have
![\dfrac1x+\dfrac1{4x}=\dfrac13](https://tex.z-dn.net/?f=%5Cdfrac1x%2B%5Cdfrac1%7B4x%7D%3D%5Cdfrac13)
![\implies\dfrac5{4x}=\dfrac13](https://tex.z-dn.net/?f=%5Cimplies%5Cdfrac5%7B4x%7D%3D%5Cdfrac13)
![\implies15=4x](https://tex.z-dn.net/?f=%5Cimplies15%3D4x)
![\implies x=\dfrac{15}4\,\text{min}=3\,\text{min}\,45\,\text{sec}](https://tex.z-dn.net/?f=%5Cimplies%20x%3D%5Cdfrac%7B15%7D4%5C%2C%5Ctext%7Bmin%7D%3D3%5C%2C%5Ctext%7Bmin%7D%5C%2C45%5C%2C%5Ctext%7Bsec%7D)
Mean means average, so you would add the numbers up and divide by the amount of numbers in the set.
Answer
5724
Step-by-step explanation:
7776+6750+6750
=21276
27000
-21276
=5724