The recipe calls for 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 would need 2 * 7 = <<2*7=14>>14 cups of borax and washing soda combined.
Therefore, the correct answer is B: 14 cups.
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
A: 28 cups
B: 14 cups
C: 21 cups
D: 7 cups
1 answer