It takes 15 electricians 24 days to wire a new housing subdivision. How many days would 18 electricians take to do the same job?

There are n gallons of gas in a tank. After x gallons have been used, in terms of n and x, what percent of the gas has not been used?

A

The number of electrician to the number of days are INVERSELY PROPORTIONAL

Therefore,

(number of electricians)(number of days) = constant

(15)(24) = 360

then, (18)(x) = 360 where x = number of days to wire a new housing subdivision

x = 360/18 = 20 days

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After x gallons have been used, then n-x gallons are left

Then, the percentage of gas that has not been used is

[(n - x) / n]*100

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