Question 787091
separate the information

2 solutions, we'll call them x and y

x + y = 62 liters

.4x + .25y = .31% solution

multiply 62 liters by .31 percent solution

.4x + .25y = 19.22

lets get rid of the decimal points by moving them over...

x  +  y  = 62
40x + 25y = 1922


now, lets do this using the subtraction method, multiply the top line by - 25
then subtract to the bottom equation
-25x - 26y = -1550
40x + 26y = 1922

15x   = 372

divide both sides (of the bottom equation) by 15

x = 24.8 liters

now that we know what x is, we plug that into the original equation and find out what y is...

24.8 + y = 62

y = 37.2 liters

solution 40% solution will be 24.8 liters, 25% solution will be 37.2 liters

hope this helps :)