The HCF of two numbers is 21 and their LCM is 840 . If one of the numbers is 49 , then the other number is:
Answer & explanation
Correct answer: option 4
LCM of two numbers is 840 and their HCF is 21
⇒ Let the other number be x
⇒ According to the question
⇒ LCM × HCF = 49 × x
⇒ 840 × 21 = 49 × x
⇒ x = 360