D. Nine to eleven, a quick google search solves that
40 bars ...............................................................................................
On Monday and Tuesday, the process appears to be out of control.
<u>Explanation</u>:
- There are five days Monday, Tuesday,Wednesday, Thursday and Friday. Monday and Tuesday have weight up to 21. Wednesday weights up to 21.
- Thursday and Friday weigh up to 20. Except for Monday and Tuesday, all the days have packaged up to the value of 21. So Monday and Tuesday are the days that appear to be out of control.
- On checking the package for each day he came to know that Monday and Tuesday have process out of control.