yes....you can use any calculator that you are comfortable with....
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The answer is 17, 17 multiple by 5 is 85.
It is so very simple and quick to get the answer, especially since if you need to, you can use the calculator that comes with your computer. But since you are not able to do so, the answer is 167 .
You add up the numbers, then divide by how many numbers you added. Here there are 4 numbers to add up: 81+83+87+85. Use a calculator or do longhand. Then divide the sum by 4 to get the average.
85.3333
42 1/2 To find the answer, divide 85 by 2 (I'm guessing if you looked at the programs on your computer, you might find it has a calculator. )