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Question
Which of the following is a common factor of 20 and 45?
Which of the following is a common factor of 20 and 45?
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Solution
The correct option is D 5
Factors of 20 = 1, 2, 4, 5–, 10 and 20
Factors of 45 = 1, 3, 5–, 9, 15, and 45
∴ 5 is a common factor of 20 and 45.
9, 15 and 45 are factors of 45, but not of 20.
Factors of 20 = 1, 2, 4, 5–, 10 and 20
Factors of 45 = 1, 3, 5–, 9, 15, and 45
∴ 5 is a common factor of 20 and 45.
9, 15 and 45 are factors of 45, but not of 20.
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