human
A car uses 20 gallons of gas to travel 400 miles. Mr. Montero's car has 8 gallons in it. How many more gallons of gas does he need to travel 600 miles, back and forth?
assistant
How many miles does Mr. Montero travel? ** Mr. Montero is traveling a total distance of 600 miles + 600 miles = <<600+600=1200>>1200 miles.
How many sets of 400 miles are there? ** There are 1200 miles / 400 miles = <<1200/400=3>>3 sets of 400 miles in 1200 miles.
How many gallons of gas does Mr. Montero need? ** So Mr. Montero needs 20 gallons/set x 3 sets = <<20*3=60>>60 gallons in all.
How many more gallons of gas does he need? ** Since his car has 8 gallons already, then he needs to add 60 gallons - 8 gallons = <<60-8=52>>52 gallons more.
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