Question

The ten's digit of a number is five time's its unit's digit. What is the number?

Answer 1

Answer:

The answer is 51

Step-by-step explanation:

Let unit digit be x

Tens digit be 5x

So if x is 1 then,

No. obtained is =

5x*10= 50x

50x+x= 51x

(50*1=50; 50+1=51)

Answer 2

$let \: the \: unit \: digit \: be \: x \\ so \: tens \: digit = 5x \\ so \: number \: obtained = 5x \times 10 + x \ = 50x + x = 51x \\ so \: the \: number \: is \: 51x$