H.C.F and L.C.M of Numbers with Explanation

Q22. Which of the following is a pair of co-primes?

A. (23, 92) B. (16, 62)
C. (21, 35) D. (18, 25)

Q23. The product of the L.C.M. and H.C.F. of two numbers is 24. The difference of two numbers is 2. Find the numbers.

A. 6 and 4 B. 8 and 6
C. 8 and 10 D. 2 and 4

Q24. The L.C.M. of three different numbers is 120. Which of the following cannot be their H.C.F.?

A. 8 B. 24
C. 35 D. 12

Q25. H.C.F. of 3240, 3600 and a third number is 36 and their L.C.M is 24 x 35 x 52 x 72. The third number is:

A. 25 x 52 x 72 B. 22 x 35 x 72
C. 22 x 53 x 72 D. 23 x 35 x 72