Lenny is making his own laundry soap. The recipe calls for 2 parts borax, 2 parts washing soda, and 1 part soap flakes. If Lenny uses 7 cups of soap flakes, how many cups of borax and washing soda combined does he need?
1 answer
According to the recipe, Lenny needs to use 2 parts borax and 2 parts washing soda for every 1 part of soap flakes. Since Lenny is using 7 cups of soap flakes, he will need 2 * 7 = <<2*7=14>>14 cups of borax and washing soda combined.