Question

the unit digit of a two digit number is 3 and seven times the sum of the digit is the number itself find the number​

Answer 1

Answer: Number =63

Step-by-step explanation:

Number =y×10+x

Given x=3

7(x+y)=10y+x...(1)

7(3+y)=10y+3

21+7y=10y+3

−3y=−18

y=6

Answer 2

Answer:

Let the tens place be X .

the units place digits is 3 .

therefore - > Number = ( 10x + 3 )

Given

7 ( x + 3 ) = ( 10x + 3 )

7 x + 21 = 10x + 3

Therefore - > 10x - 7x = 21 - 3

= > 3 x = 18

or x = 6

using x = 6 in equation ( 1 ) ..

The number is 63 .

Step-by-step explanation: