On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is:
Answers:  A) 47619  B) 49619  C) 47719  D) 57619  E) 47611
Last digit should be 9.   when multiplying 7 with 9 , we get 63.   place 3 at unit place , we get 6 as carry.   Next digit of number should be such that we get product with 7 as a number whose last digit is 13-6= 
<gadget id="calculator">13-6</gadget>
<output>7</output>
7.   such number is 1.   when 7 is multiplied with 1 , we get 7.   add carry 6 to it and we get 13.   so 3 will get at tens place and 1 carry for next place.   so next digit should give last digit as 2 (3-1=2).   such digit is 6.   ...   ..   so continuing like this , we get desired number as 47619   47619NSWER:47619
<result>A</result>
On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is: