Question

if the sum of the digit of two digit number is 4 and if it's unit digit is 1 then it's tens digit is ..........​

Answer 1

Answer:

Lettheunitsdigit=x

Tensdigit=x+4

x+4:x::3:1

3x=x+4

2x=4

x=2

Tensdigit=6

No.=62