Question

3 The sum of the digits of a 2-digit number is 7. If the digits are
reversed, the number formed is 9 less than the original number. Find
the number.​

Answer 1

Answer:

let the no be 43

the sum of 4 and 3 is 7

if they are reversed it comes out to be 34 which is 9 less than the original I.e 43

Answer 2

Answer:

43

Step-by-step explanation:

x + y = 7

x = 7-y

Number = 10x + y

New no. = 10y + x

10y + x +9 = 10x + y

10y + (7 - y) + 9 = 10(7-y) + y

18y = 70-16

18y = 54

y = 3

x = 7-y = 4