The recipe calls for 2 parts borax, 2 parts washing soda, and 1 part soap flakes. This means the total parts of the mixture can be represented as:
- Borax: 2 parts
- Washing soda: 2 parts
- Soap flakes: 1 part
Total parts = 2 (borax) + 2 (washing soda) + 1 (soap flakes) = 5 parts.
If Lenny uses 7 cups of soap flakes, which represents 1 part in the recipe, we can find out how many cups each part represents:
1 part = 7 cups (soap flakes).
Now, we'll find the number of cups for the other ingredients using the ratio of their parts:
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For borax (2 parts): \[ 2 \text{ parts} \times 7 \text{ cups/part} = 14 \text{ cups} \]
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For washing soda (2 parts): \[ 2 \text{ parts} \times 7 \text{ cups/part} = 14 \text{ cups} \]
Now, to find the total amount of borax and washing soda combined:
\[ 14 \text{ cups (borax)} + 14 \text{ cups (washing soda)} = 28 \text{ cups} \]
Therefore, Lenny needs 28 cups of borax and washing soda combined.
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