Question

Grant plans to evaporate enough water from 22 gallons of a 16% ammonia solution to make a 24% ammonia solution. Which equation can he use to find n, the number of gallons of water he should remove?

Answer 1

Answer:

C.

Step-by-step explanation:

First, we calculate the amount if ammonia in 22 gallons of 16% ammonia solution.

16% * 22 gal = 3.52 gal

The amount of ammonia remains the same after the water evaporates, but the total amount of solution is reduced by the amount of water that evaporates.

amount of ammonia: 3.52 gal

amount of water that remains: 22 - n

desired concentration, 24% = 24/100

Equation:

(3.52)/(22 - n) = 24/100

Answer: C.