Arnold owns three cars. The first car averages 50 miles per gallon of gas. The second car averages 10 miles per gallon of gas. And the third car averages 15 miles per gallon of gas. He splits his 450-mile monthly driving mileage equally amongst his three cars.  If gas costs $2 per gallon, how much does he spend on gas each month?
He drives each vehicle 150 miles because 450 / 3 = <<450/3=150>>150
The first car will need 3 gallons of gas because 150 / 50 = <<150/50=3>>3
The second car will need 15 gallons of gas because 150 / 10 = <<150/10=15>>15
The third car will need 10 gallons of gas because 150 / 15 = <<150/15=10>>10
He will need 28 gallons in total because 3 + 15 + 10 = <<3+15+10=28>>28
This will cost him $56 because 28 x $2 = $<<28*2=56>>56
#### 56