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To find out how many cups of borax and washing soda combined Lenny needs, we need to determine the total number of parts in the recipe.
The recipe calls for 2 parts borax + 2 parts washing soda + 1 part soap flakes = 5 parts in total.
Since Lenny is using 7 cups of soap flakes, 1 part is equal to 7 cups.
Therefore, the total amount of borax and washing soda combined that Lenny needs is:
2 parts borax + 2 parts washing soda = 4 parts.
Each part is equal to 7 cups, so 4 parts * 7 cups/part = 28 cups.
Lenny needs a total of 28 cups of borax and washing soda combined.
Therefore, the correct answer is:
28 cups