A train consisting of 50 cars and one locomotive weighs a total of 4725 tons. The locomotive weighs 125 tons. All of the cars have the same weight. Find the weight (in tons) of one car.
Let x = the weight of each car (they all weigh the same)
Let 50x = the weight of all 50 of them
125 = the weight of the locomotive
4725 = the weight of everything (cars and locomotive)
$\displaystyle 50x+125=4725$
Can you solve this equation to find the weight of one car? Just subtract 125 from both sides, then divide both sides by 50.
Good luck!