Respuesta :

Trial 2: 1. 10 2. 15 3. 30 4. 26 5. 13 6. 3
Trial 3: 1. 6 2. 11 3. 22 4. 18 5. 9 6. 3
You could pick the number 20.

1. 20
2. 25    20+5=25
3. 50    25x2=50
4. 46    50-4=46
5. 23    46÷2=23
6. 3      23-20=3

I hope this helps.