If a fleet on n taxis uses g gallons of gasoline every 3 days, how many gallons of gasoline will be used by four taxis every 8 days?

Question

Hello! Can you please help me solve this question and explain along the way!! Thank you!

Answer 1

I don' think this is solvable as stated.  Example:let 10 taxis use 90 gal in 3 days.  So, each taxi uses 3 gal/day.  Therefore, 4 taxis using 3 gal/day each times 8 days = 96 gallons.  BUT, what if ,for example, there were 100 taxis?  Then 100 taxis using 90 gallons in 3 days, each taxi uses only .3 gal/day.  So 4 taxis times .3 gal/day each x 8 days = 9.60 gal.

 

In general, for two variables you need to be able to write two equations.

 

Did you leave something out?