Question

A formula for 8 bottles of window cleaner calls for 6 cups of rubbing alcohol, 2 and one-fourth gallons of water, and 1 and one-half cups of ammonia. How many quarts of rubbing alcohol would the formula call for if a factory made 1,280 bottles for stores to sell to customers?

24 quarts
48 quarts
240 quarts
480 quarts

Answer 1

\[\frac{ 6~cups~rubbing~alcohol }{ 8~bottles~cleaner }=\frac{ x~cups~rubbing~alcohol }{ 1280~bottles~cleaner }\]
solve for x to get the amt. of rubbing alcohol in cups
from there, since 1 quart = 4 cups, divide by 4 to get quarts