Answer:
133
Explanation:
38/2=19
1 hour = 19 clean windows
7 hours *19 =133
133 windows
We can use ratios to solve
38 windows x windows
----------------------- = ----------------
2 hours 7 hours
Using cross products
38 *7 = 2x
266 = 2x
Divide each side by 2
266/2 =2x/2
133 =x
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