Answer: (0,-3)
Explanation: use desmos.con it will help! :)
11 lbs 5 oz - 1 lb 15 oz...we are gonna have to borrow...there is 16 oz in a lb.
11 lbs 5 oz....we r going to borrow 1 lb from the right side and add it to the left side making it 10 lbs and 21 oz...u see what I did...I borrowed 1 lb from the right side and added 16 oz to the left.Now we can subtract.
10 lbs 21 oz - 1 lb 15 oz = 9 lbs 6 oz <== ur answer
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Step-by-step explanation:

You cross the date line into Monday.
_____
The next day after Monday is Tuesday. (I find it difficult to tell the intent of the question.)