Question

I need step by step explanation for this!

Answer 1

49

Explanation:

let unit digit=x

ten's digit=y

then x+y=13

x=13-y

also x=2y+1

13-y=2y+1

13-1=2y+y

3y=12

y=12/3=4

x=13-4=9

so number =10×4+9=49

Answer 2

61

Explanation:

1. 13 - 1 = 12
2. 12 ÷ 2 = 6
3. Put 6 and 1 together: 61

Therefore, the number is 61

Let's check:

1. 6 × 2 = 12
2. 12 + 1 = 13

The sum of the two digits is 13, and we got that, so we are correct. The number is 61.