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

Problems on H.C.F and L.C.M
Two numbers are in the ratio of 15 : 11. If their H.C. F. is 13, Find he numbers .

195 and 163
185 and 133
175 and 123
195 and 143

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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
4
15
10

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Problems on H.C.F and L.C.M
The least number which is a perfect square and is divisible by each of the numbers 16, 20 and 24, is:

14400
3600
1600
6400

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Problems on H.C.F and L.C.M
The H.C.F of two numbers is 8. Which of the following can never be their L.C.M?

56
24
48
60

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Problems on H.C.F and L.C.M
Four bells begin to toll together respectively at the intervals of 8, 10, 12 and 16 seconds. After how many seconds will they toll together again?

246 seconds
243 seconds
240 seconds
242 seconds

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Problems on H.C.F and L.C.M
The H.C.F and L.C.M of two numbers are 84 and 21 respectively. If the ratio of the two numbers is 1 : 4 , then the larger of the two numbers is

108
84
48
12

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