Question

I thought of a two-digit number. The unit digit of my number is a prime number, and the tens digit is four times as big as the unit digit. What is my number?

Answer 1

Answer:

let the number is 10x + 3.

then sum of its digits = x + 3.

from given condition, we have

x+3 = (1/7)* (10x + 3)

=> 7x + 21 = 10x + 3

=> 3x = 18

=> x = 6

therefore the number is 63.

Step-by-step explanation:

Answer 2

41

1 is a prime number

4 is 4 times bigger then 1