Question

the ones digit of a two digit number is two more than the tens digit. the sum of the digit is 4. what is the number

Answer 1

Let tens digit=x
ones digit=x+2
the sum of digit is 4
according to question
x+x+2=4
2x=4-2
2x=2
x=2/2
x=1
tens digit=1
ones digit=1+2=3
number=13

Answer 2

One's digit = X
Ten's digit= Y

Y=2+X

X+Y=4
2+X+X=4
2+2X=4
2X=2
X=1

As we know...
Y=2+X
Y=2+1
Y=3

Hence the number is 13.

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