Question

Brine is a solution of salt and water. If a tub contains 50 gallons of a 5% solution of brine, how much water must evaporate to change it to an 8% solution?



81.25 gallons

62.50 gallons

18.75 gallons

Answer 1

Thanks that helps. @perl

Answer 2

thanks = medal

Answer 3

What is the next step though? I don't really understand the whole process

Answer 4

i did

Answer 5

does that expression make sense>

Answer 6

the numerator is the pure salt, the denominator is the total liquid

Answer 7

Ok, thanks, @perl

Answer 8

hmm, one moment

Answer 9

wolfram says there is no solution

Answer 10

Well, there should be...hmm..

Answer 11

ok lets do it differently

Answer 12

what is 5% of 50

Answer 13

2.5 gallons of salt

Answer 14

oh, only water evaporates, not the salt!!