MATH SOLVE

6 months ago

Q:
# Carlon plans to evaporate a number of gallons of water from 90 gallons of a 15% salt solution to make a 25% salt solution. Which equation can he use to find x, the number of gallons that should be evaporated?

Accepted Solution

A:

The first thing we will do for this case is define variables.

We have then:

x = amount of water to evaporate.

90-x = amount of water after being evaporated.

The amount of salt is:

S = 90 * 0.15 = 13.5

The percentage of salt will be:

% S = 13.5 / (90 - x) = 25/100

Answer:

An equation can be used to find x, the number of gallons that should be evaporated is:

13.5 / (90 - x) = 25/100

We have then:

x = amount of water to evaporate.

90-x = amount of water after being evaporated.

The amount of salt is:

S = 90 * 0.15 = 13.5

The percentage of salt will be:

% S = 13.5 / (90 - x) = 25/100

Answer:

An equation can be used to find x, the number of gallons that should be evaporated is:

13.5 / (90 - x) = 25/100