If 7 maids cleaned 7 floors in 7 hours, how long would it take 3 maids to clean 3 floors?
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If 7 maids cleaned 7 floors in 7 hours, how long would it take 3 maids to clean 3 floors?
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Answer: C. C) 7 hours
One maid cleans 1 floor in 7 hours (rate = 1/7 floor/maid/hr). Therefore, 3 maids cleaning 3 floors work at 3 * (1/7) = 3/7 floors/hr, taking 3 / (3/7) = 7 hours.
Step-by-step Derivation:
Step 1: Work formula: (M1 * T1) / W1 = (M2 * T2) / W2.
Step 2: (7 maids * 7 hours) / 7 floors = (3 maids * T2) / 3 floors.
Step 3: 7 = T2 => T2 = 7 hours.