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The LCM of two co-prime numbers is 638. If one number is 29, then the other number is:
Question

The LCM of two co-prime numbers is 638. If one number is 29, then the other number is:

A.

32

B.

22

C.

11

D.

13

Correct option is B

Given:
LCM of two co-prime numbers = 638
One of the numbers = 29
Concept Used:
For two co-prime numbers (numbers with no common factors other than 1), the LCM is simply the product of the two numbers.
Solution:
Let the other number be x.
29 × x = 638
x = 63829\frac{638}{29}​ = 22
Thus, The other number is 22.

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