It means = not +.
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When a math question asks for the total, it is looking for the sum as an answer.
The mean times three will be the total of all three numbers. Multiply the mean times three and subtract the sum of the two numbers from that total.
You would usually associate total with add. However getting a total can sometimes involve having to subtract something.
It is called the mean average.
It means what the answer all together is. For example: 5+8=13. 13 is the total.