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What is the greatest common numerical factor of \(15p+20q\)?

Answer and explanation

Correct answer: 5

Answer: B, 5. The question asks only for the greatest common numerical factor, so focus on the numbers 15 and 20; the variables p and q are different and are not part of the numerical factor. List the positive factors: factors of 15 include 1, 3, 5, 15; factors of 20 include 1, 2, 4, 5, 10, 20. The greatest number appearing in both lists is 5. Thus, 5 is the numerical HCF and \(15p+20q=5(3p+4q)\). Option A, 10, does not divide 15. Option B, 5, divides both 15 and 20 and is the greatest such number. Option C, 15, does not divide 20. Option D, 20, does not divide 15. Memory cue: for a numerical common factor, ignore unlike variables and find the HCF of the coefficients. Then verify by dividing both coefficients exactly.

Related tags

HcfCommon FactorFactorisationCoefficientsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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