The ratio of borax to soap flakes is 2:1, so Lenny needs 2 parts of borax for every 1 part of soap flakes. Since Lenny uses 7 cups of soap flakes, he needs 2/1 * 7 = <<2/1*7=14>>14 cups of borax.
The ratio of washing soda to soap flakes is also 2:1, so Lenny needs 2 parts of washing soda for every 1 part of soap flakes. Since Lenny uses 7 cups of soap flakes, he needs 2/1 * 7 = <<2/1*7=14>>14 cups of washing soda.
Therefore, Lenny needs a total of 14 + 14 = <<14+14=28>>28 cups of borax and washing soda combined. Answer: \boxed{28}.
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?
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1 answer