Question

Find the last number which when divided by 6,15,18 leaves a remainder 5 in each card

Answer 1

6-5 = 1

15-5 = 10

18-5 = 13

Now HCF of 1,10 and 13 is:

1 = 1*1

10 = 1*2*5

13 = 1*13

HCF(1,10,13) = 1

Therefore,

The least number which when divided by 6,15,18 leaves a remainder 5 in each card is 1

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