Question

The sum of digits of two difit no is 12. if 18 is added to it ,the digits are reversed , find the number​

Answer 1

Answer:

69

Step-by-step explanation:

Answer 2

Answer:

The number is 57

Step-by-step explanation:

Let,

Tens place number = x

Units place number = y

➙x + y = 12----------------(1)

10x + y is the number

➙ 10x + y +18 = 10y + x

➙ 10x -x + y - 10y = -18

➙ 9x -9y = -18

➙ 9(x - y) = -18

➙ x - y = -18 / 2

➙ x - y = -2-----------------(2)

Adding equation (1) and (2)

➙ 2x = 12 - 2

➙ 2x = 10

➙ x = 10 / 2

➙ x = 5

Tens place = 5

Units place = y

➙ x + y = 12

➙ 5 + y = 12

➙ y = 12 - 5

➙ y = 7

Units place = 7

Therefore,

The number is 57