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Question

What should be added to 6715 to get 815?
(a) 11115
(b) 11115
(c) 443
(d) 344

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Solution

Let x be added to 6715 to get 815

6715+x=815

x=715815

x=9715415

L.C.M. of 5 and 15 is 15

x=9715415×33

x=971512315

x=2615

x=11115

Therefore, 11115 is the required number.

Hence, Option (b) is correct.


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