model 2 find lcm of numbers Practice Questions Answers Test with Solutions & More Shortcuts

Question : 11 [SSC CGL Prelim 2004]

If the students of a class can be grouped exactly into 6 or 8 or 10, then the minimum number of students in the class must be

a) 240

b) 180

c) 120

d) 60

Question : 12 [SSC CGL 2012]

The greatest number of four digits which when divided by 3, 5, 7, 9 leave remainders 1, 3, 5, 7 respectively is :

a) 9765

b) 9766

c) 9764

d) 9763

Question : 13 [SSC CGL Prelim 2002]

Find the greatest number of five digits which when divided by 3, 5, 8, 12 have 2 as remainder :

a) 99962

b) 99960

c) 99958

d) 99999

Question : 14 [SSC CGL Tier-II 2017]

Three electronic devices make a beep after every 48 seconds, 72 seconds and 108 seconds respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

a) 10 : 07 : 48 hours

b) 10 : 07 : 36 hours

c) 10 : 07 : 24 hours

d) 10 : 07 : 12 hours

Question : 15

Which is the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?

a) 196

b) 630

c) 1260

d) 2520