Question

if input is a two digit number:
input → add 7 → output
if input is a one digit number:
input → double the input → output

input | output
23 | □
2 | □
13 | □
10 | □

Explanation:

Step1: Process input 23 (2-digit)

$23 + 7 = 30$

Step2: Process input 2 (1-digit)

$2 \times 2 = 4$

Step3: Process input 13 (2-digit)

$13 + 7 = 20$

Step4: Process input 10 (2-digit)

$10 + 7 = 17$

Answer:

Input	Output
2	4
13	20
10	17