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)
Responses
7 cups
7 cups
14 cups
14 cups
21 cups
21 cups
28 cups
28 cups
To determine the amount of borax and washing soda needed, we need to add the parts together.
If the recipe calls for 2 parts borax and 2 parts washing soda, and 1 part soap flakes, then the total ratio of the ingredients is:
2 (borax) + 2 (washing soda) + 1 (soap flakes) = 5 parts
Since Lenny is using 7 cups of soap flakes, we can divide this amount by the total parts to find the amount per part:
7 cups / 5 parts = 1.4 cups per part
Now, we can calculate the amount of borax and washing soda using the ratio:
2 parts * 1.4 cups per part = 2.8 cups of borax
2 parts * 1.4 cups per part = 2.8 cups of washing soda
Therefore, Lenny needs a combined total of 2.8 cups of borax and 2.8 cups of washing soda. The closest option is 28 cups.