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Step-by-step explanation:

Remark

The simplest way is to change the fractions to decimals.

Givens

8 3/10 = 8.3

1 2/5 =  1.4

2 1/3 = 2.3333333

4 3/5 = 4.6

Formula

Left over Ribbon = What she bought - bow - package amount + Joe

Solution

Left over ribbon = 8.3 - 2.3333 - 1.4 + 4.6

Left over ribbon = 9.1666

0.1666667 = 1/6

So if you need the fraction, it is 9 1/6