Question

PLZ PLZ, SOMEONE HELP ME ON THIS PROBLEM!!!
How many quarts of pure antifreeze should Kelly add to 10 quarts of a 20% antifreeze solution to make a 50% antifreeze solution?

Answer 1

10 quarts is 20 percent, therefore you times by 5 to get 100 percent. So 100 percent = 50 quaarts and 50 percent = 25 quarts.

Answer 2

can you please write that in number form..so i can see how it looks?

Answer 3

20%=10 quarts
100%= 50 quarts
50%= 25 quarts

Answer 4

get it?

Answer 5

or u can do it this way:
let x = no. of quarts to be added then:

0.2* 10 + x = 0.5(x + 10)
2 + x = 0.5x + 5
o.5x = 3
x = 15

you need to add 15 quarts