Question

The LCM of two numbers is 210. If their HCF is 35 and one of the numbers is 105, find the other number.

• A. 35
• B. 70
• C. 105
• D. 140

Answer 1

Answer:

B. 70

$$Let the two numbers be 105,y

$LCM\times{HCF}=105\times{y}$

$LCM=210; HCF=35$

$210\times{35}=105\times{y}$

$y=2\times35$

$y=70$