Answer:
30
Step-by-step explanation:
20% = 20/100= 1/5
It is 1/5 of the number 150
Taking the problem what is 20% of 150
Is means equals and of means multiply
what is 20% of 150
W = 20% * 150
Change 20% to a decimal
W = .20 * 150
W = 30
10 percent increase because she had an 80 percent and if it is 90 percent it's a ten percent increase
Answer:14.26 dollars per year
Step-by-step explanation:
Answer:
The correct option is B) 12.
Step-by-step explanation:
Consider the provided information.
Working alone at its constant rate, pump X pumped out ¼ of the water in a tank in 2 hours.
As we know:
,
The rate of pump X is ![\frac{\frac{1}{4}}{2} = \frac{1}{8}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cfrac%7B1%7D%7B4%7D%7D%7B2%7D%20%3D%20%5Cfrac%7B1%7D%7B8%7D)
of the water is pumped out of the tank, that means only
is left to be pumped out.
All 3 pumps pumped out the remaining
of the water out in 3 hours.
The combined rate of all three pumps is:
Pump Y, working alone at its constant rate, would have taken 18 hours to pump out the rest of the water.
The rate of pump Y =
Let z is the time taken by pump Z, then the rate of pump Z is
.
Therefore,
![\dfrac{1}{8}+\dfrac{1}{24}+\dfrac{1}{z}=\dfrac{1}{4}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B8%7D%2B%5Cdfrac%7B1%7D%7B24%7D%2B%5Cdfrac%7B1%7D%7Bz%7D%3D%5Cdfrac%7B1%7D%7B4%7D)
Multiplying both sides by 24 z.
![3z + z + 24 = 6z\\24 = 2z\\12 = z](https://tex.z-dn.net/?f=3z%20%2B%20z%20%2B%2024%20%3D%206z%5C%5C24%20%3D%202z%5C%5C12%20%3D%20z)
Hence, the correct option is B) 12.