7000 add 40000000000 = 40000007000
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40000000000000000000
It is 40,000,420,000
To calculate the average of two numbers, add them together, and divide the result by 2. (For the average of three numbers, you add up the three numbers, and divide by three, etc.) The average is (5000 + 7000)/2 = 6000
40000000000
It is forty billion or as 4.0*1010 in scientific notation