1.4x*0.8=x+300

1. 12x=x+300

0. 12x=300

x=2500

The second question, the original planned time is X.

20x-8=22x-22

2x= 14

x=7

The third question assumes that Otsuichi's hourly workload is X, then A's hourly workload is (x+2).

(x+2)*5+(2x+2)*4=200

x= 14