Question

In a two digit number, unit’s digit is twice the ten’s digit. If the digits are reversed, new number is 27 more that the original number. Find the number

Answer 1

Answer:

36

Step-by-step explanation:

let's say unit's digit is x and ten's digit is y

then number = 10*y + x

it is given that 2*y = x .....eq 1

now if the digits are reversed, then

reversed number = 10*x + y

it is given that

10*x + y = 27 + 10*y +x

9*x - 9*y = 27

x - y = 3

putting 2*y= x from eq 1,

2y - y =3

y = 3 hence x = 2y = 6

so, the number is 10y+x = 30 + 6 = 36

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