Word Problem 4

[ocgirl83]

How many gallons of pure alcohol should be mixed with 20 gal of a 15% alcohol solution to obtain a mixture that is 25% alcohol?

 

[stapel]

gallons solution:
15%: ??
pure: x
mix: ??

percent alcohol:
15%: ??
pure: 1
mix: ??

gallons alcohol:
15: ??
pure: (1)(x)
mix: ??

Complete the table. Set the input alcohol amounts equal to the total alcohol in the mix. Solve.

Eliz.