the answer is.... (dun dun dun) 19 nineteen.
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Any of them. To get 50 to 30 you could... subtract 20 add -20 divide by 5/3 multiply by 3/5
-5+-3 = -8 ++ Add -- Add +- Subtract -+ Subtract
Yes, since adding a minus is the same as subtracting a plus; for example 5 - 3 = 2 5 - (+3) = 2 5 + (-3) = 2
The inverse operation for subtract 5 is add 5. This is because whatever number you start with, if you first "subtract 5" and then "add 5" or if you first "add 5" and then "subtract 5" you are back to the number you started with.
5 & 3