HCF and LCM Quiz Set 015 | Maths Aptitude Quiz Questions and Mock Test on HCF and LCM Set 15 | mock tests for Bank PO, SSB/SSC Exams, SO Clerical Exam, GATE Exam, LIC AO, GIC AO, etc.

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Question 1

Find the least possible number that can be divided by 33, 96 as well as 27?

9504.

19008.

4752.

28512.

Soln.
Ans: a

The required number is LCM = 9504.

Solution | Discuss! | Chapters»

Question 2

The product of LCM and HCF of two numbers is 6300? If one of the numbers is 75, what is the other?

84.

86.

85.

87.

Soln.
Ans: a

Product of two numbers is equal to the product of their LCM and HCF. So the other number is $6300/75$ = 84.

Solution | Discuss! | Chapters»

Question 3

Three lights are flashing at regular intervals. They, respectively, flash after 9, 18 and 27 seconds. How many times do they together flash in 432 seconds?

9 times.

10 times.

8 times.

11 times.

Soln.
Ans: a

They will together flash after the LCM of their times. The LCM of 9, 18 and 27 = 54. So they will flash 1 + $432/54$ = 9 times.

Solution | Discuss! | Chapters»

Question 4

What is the HCF of 6, 84 and 171?

Soln.
Ans: a

The required HCF = 3.

Solution | Discuss! | Chapters»

Question 5

Three lights are flashing at regular intervals. They, respectively, flash after 21, 42 and 63 seconds. How many times do they together flash in 1008 seconds?

9 times.

10 times.

8 times.

11 times.

Soln.
Ans: a

They will together flash after the LCM of their times. The LCM of 21, 42 and 63 = 126. So they will flash 1 + $1008/126$ = 9 times.

Solution | Discuss! | Chapters»