Question : Find the greatest number that exactly divides 15, 30, and 40.
Option 1: 3
Option 2: 40
Option 3: 5
Option 4: 15
Correct Answer: 5
Solution : 15 = 5 × 3 30 = 5 × 3 × 2 40 = 5 × 2 × 2 × 2 $\therefore$ HCF of 15, 30, and 40 = 5 Hence, the correct answer is 5.
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