The average of 40 and 70 is equal to (40 + 70)/2 = 55.
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40
35 as in 30 + 40 = 70 then as there are two numbers divide by two, then 70 / 2 = 35 or 30 + 5 = 35 = 40 - 5
70
The average is: (127+70)/2 = 98.5
30% off of 40 dollars = 70% [left] of 40 dollars = 40*70/100 = 28 dollars