It will come out to a flat number like 10 20 30 40 ect and the counterfeit will have a 1 at the end such as 11 21 31 41.
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The time it takes to install 1 insulator would be 1.25 hours
The rate of change is (amount of the change) / (time it took to change) .
Amount of the change = (3 - 1) = 2 .
Rate of change = (2) / (time it took to change from 1 to 3) .
The dependent variable is 5 and the independent is 15
Their would be 21 different solutions for this problem