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80 + 10 equals 90 so the missing value is zero, ie 80 + 10 = 90 - 0
160/200 = 80/100 = 8/10 = 4/5 = 80 percent or 0.8
There are infinitely many possible answers. Two of these are 1*80 and 100*0.8
Nitrogen.
80 - 10 = 30 + 40Both sides of the sum now equal 70.