11) The LCM of 5,8,12,20 will not be a multiple of
a) 3
b) 9
c) 8
d) 5
12) In the above question, find how many times they will ring together during the next 12 min?
a) 9
b) 10
c) 11
d) None of these
13) GDC is (x2 – 4) and (x2 +x – 6) is
a) (x + 2)
b) (x – 2)
c) (x2 – 2)
d) (x2 + 2)
14) The HCF of two numbers is 21 and their sum is 105. The LCM of the numbers is
a) 189 or 147
b) 126 or 84
c) 84 or 145
d) 126 or 145
15) Find the largest number of four digit exactly divisible by 12,15,18 and 27.
a) 9720
b) 9937
c) 9999
d) 9921
16) How many numbers are there between 4000 and 6000 which are exactly divisible by 32, 40, 48 and
60?
(a)2
(b) 3
(c) 4
(d) 5
Ans: c
17) In a store, there are 345 L mustard oil, 120 L sunflower oil and 225 L soyabean oil. What will be the
capacity of the largest container to measure the above three types of oil?
(a)8 L
(b) 20 L
(c) 23 L
(d) 15 L
(e) None of the above
Ans: d
18) The LCM of two numbers is 495 and their HCF is 5. If sum of the numbers is 100, then find the difference of the numbers.
(a)10
(b) 46
(c) 70
(d) 90
(e) None of the above
ans: a
19) If HCF of two numbers is 8, which of the following can never be their LCM?
(a) 24
(b) 48
(c) 56
(d) 60
(e); None of the above
ans: a
20) Find the LCM of (2s x 3 x 52 x 7) (24 x 32 x 5 x 72 x 11) and (2 x 3s x 54)
(a) 24 x 33 x 54
(b) 2 x3x7 x5x11
(c; 24x33x54x72x11
(d) 24 x 34 x 54 x 7
ANS: c