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 point)
7 cups
14 cups
21 cups
28 cups
According to the recipe, Lenny needs 2 parts borax and 2 parts washing soda for every 1 part soap flakes. Since he is using 7 cups of soap flakes, he would need 7 cups of both borax and washing soda. Therefore, Lenny needs a total of 7 cups of borax and 7 cups of washing soda.
The combined total of borax and washing soda is 7 cups + 7 cups = 14 cups.
Therefore, the answer is 14 cups.