Question

A two-digit number is three times the sum of its digits. Then the unit place digit of the number is: ​

Answer 1

Answer:

The answer is:

Step-by-step explanation:

Let the unit place of the number = x

and the ten place = y

The number will be =10y+x

According to question

10y+x=3(x+y)

10y+x=3x+3y

7y−2x=0 ......(i)

Again

(10y+x)+45=10x+y

10y+x+45=10x+y

9y−9x=−45

x−y=5 ........(ii)

x=5+y

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