Problems On Hcf And Lcm

A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?

A:

26 minutes and 18 seconds

B:

42 minutes and 36 seconds

C:

45 minutes

D:

46 minutes and 12 seconds

Answer: D

L.C.M. of 252, 308 and 198 = 2772.

So, A, B and C will again meet at the starting point in 2772 sec. i.e., 46 min. 12 sec.

📖

The least number which when divided by 5, 6 , 7 and 8 leaves a remainder 3, but when divided by 9 leaves no remainder, is:

A:

1677

B:

1683

C:

2523

D:

3363

Answer: B

L.C.M. of 5, 6, 7, 8 = 840.

Required number is of the form 840k + 3

Least value of k for which (840k + 3) is divisible by 9 is k = 2.

Required number = (840 x 2 + 3) = 1683.

📖

Reduce	128352	to its lowest terms.
Reduce	238368

A:

3

4

B:

5

13

C:

7

13

D:

9

13

Answer: C

 128352) 238368 ( 1
         128352
         ---------------
         110016 ) 128352 ( 1
                  110016
                 ------------------  
                   18336 ) 110016 ( 6       
                           110016
                           -------
                                x
                           -------
 So, H.C.F. of 128352 and 238368 = 18336.
 
             128352     128352 ÷ 18336    7
 Therefore,  ------  =  -------------- =  --
             238368     238368 ÷ 18336    13

📖

The least number which should be added to 2497 so that the sum is exactly divisible by 5, 6, 4 and 3 is:

A:

3

B:

13

C:

23

D:

33

Answer: C

L.C.M. of 5, 6, 4 and 3 = 60.

On dividing 2497 by 60, the remainder is 37.

Number to be added = (60 - 37) = 23.

📖

Find the lowest common multiple of 24, 36 and 40.

A:

120

B:

240

C:

360

D:

480

Answer: C

 2 | 24  -  36  - 40

 --------------------

 2 | 12  -  18  - 20

 --------------------

 2 |  6  -   9  - 10

 -------------------

 3 |  3  -   9  -  5

 -------------------

   |  1  -   3  -  5

   

L.C.M.  = 2 x 2 x 2 x 3 x 3 x 5 = 360.

📖

Questions for: Problems On Hcf And Lcm