Question

answer of 9 and 10???​

Answer 1

Answer:

9.a.) 42724

=> Sum of the digits = 19

Since the no. divisible with 9 and greater than 19 is 27

Therefore, the least no. to be added to 42724 = 27 - 19 = 8.

9.b.) 39065

=> Sum of the digits = 23

Since the no. divisible by 9 and greater than 23 is 27

Therefore, the least no. to be added to 39065 = 27 - 23 = 4.

10.) Let the no. be a

=> The no. is 625a

Since for a no. to be divisible by 11, the difference of the sum of the digits on the even place in the no. and the sum of the digits on the odd place should be 0 or divisible by 11.

Therefore, for 625a to be divisible by 11, the difference of ( 6 + 5 ) and ( 2 + a ) should be 0 or divisible by 11.

( 6 + 5 ) - ( 2 + a ) = 11 - 2 - a = 9 - a

If 9 - a = 0, a = 9

If 9 - a = 11, a = -2

Therefore, a = 9 and the no. is 6259.