Question

In a two digit number, the units digit is x and the tens digit is y. Then the number is

• A. 10y+x
• B. 10x+y
• C. 10y-x
• D. 10x-y

Answer 1

Answer: (A)

10y+x

Suppose our number is 53.It has 3 at units digit and 5 as tens digit

So 53 can be written as $10\times 5+3$

Similarlly any 2 digit number say 'yx' with x at units digit and y as tens digit which can be written as 10x+y

Another approach is say our number is $yx$ then by dividing it with 10 we get remainder $x$ and quotient as $y$

So we know that $dividend=divisor\times quotient+remainder$

So $xy=10\times y+x$