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Problems on H.C.F and L.C.M

Problems on H.C.F and L.C.M
Three numbers are in the ratio 3:4:5 and their L.C.M is 2400. Their H.C.F is:

80
40
200
120

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Problems on H.C.F and L.C.M
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?

15
16
4
10

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

L.C.M. of 2, 4, 6, 8, 10, 12 is 120. So, the bells will toll together after every 120 seconds(2 minutes). In 30 minutes, they will toll together 30 + 1 = 16 times. 2

Problems on H.C.F and L.C.M
Six belts commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes. how many times do they toll together ?

16
15
4
10

ANSWER DOWNLOAD EXAMIANS APP

Problems on H.C.F and L.C.M
The least number of five digits which is exactly divisible by 12, 15 and 18, is:

10010
10020
10080
10015

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Problems on H.C.F and L.C.M
The greatest number of four digits that have 144 for their HCF is?

9930
9935
9903
9936

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Problems on H.C.F and L.C.M
LCM of 87 and 145 is:

435
48
1305
875

ANSWER DOWNLOAD EXAMIANS APP
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