When the operator "plus" is defined in a non-standard way.
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Using a calculator, you can find out that 50*3/50+17/2 is equal to 11.5
If you mean: -1/9 plus -5/9 then it is equal to -6/9 which simplifies to -2/3
27/45 + 20/45 = 1 and 2/45
One whole plus one half is 3 halves or 1 1/2.
It is: 2/3 plus 3/5 = 19/15