HCF and LCM

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11 Find the HCF of 59 , 12?

A
7
B
1
C
3
D
12

12 Find the LCM of 42 , 20?

A
360
B
600
C
420
D
480

13 Find the HCF of 59 , 10?

A
1
B
2
C
5
D
8

14 Two bells ring at an interval of 20 sec and 37 secs. After what least time in seconds, will both the bells ring together ?

A
770
B
740
C
640
D
880

15 The HCF and LCM of two numbers are 8 and 48 respectively. If one of the numbers is 24, then the other number is:

A
16
B
10
C
18
D
12

16 HCF of $$\frac{2}{3}, \frac{4}{5} and 6\frac{3}{7}$$ is:

A
2/105
B
2/135
C
2/115
D
2/125

17 Fourth number is missing in the below series. 133, 156, 179, ? , 225, 248

A
206
B
200
C
208
D
202

18 The HCF of two numbers is 24. The number which can be their LCM is:

A
166
B
120
C
148
D
162

19 Two bells toll at an interval of 42 and 24 seconds respectively. After they start at the same time, again after how many seconds will they rings together?

A
184
B
160
C
168
D
172

20 Two bells toll at an interval of 42 sec and 5 sec. After how many seconds, will both the bells ring together?

A
260
B
210
C
220
D
190