Question

number of two digit numbers having the property that they are perfectly divided by the sum of their digits with quotient equal to 7,is

Answer 1

Answer:

Step-by-step explanation:

In this question their is a property i.e., CYCLICITY is used :-

• 7 x 3 = 21

• 7 x 6 = 42

• 7 x 9 = 63

7 is quotient and your can check 2 + 1 = 3,

                                                       4 + 2 = 6.........

u can write any of of them

Answer 2

Answer:

you can answer it by following steps

Step-by-step explanation:

let, the units digit number be y

and ,

tens digit be x

according to question,

10x + y / x+ y = 7

10x + y = 7x + 7 y

10x - 7x = 6y

3x = 6y

x=2y

hence , the number like 21, 42,63,84 are 4 no. divisible by sum of digit by 7