SOLUTION: A bridge charges cars 4.00 and trucks 6.00 to go over. If 200 vehicles go over the bridge and the toll operator collect 860 dollars how many of the vehicles were trucks? I know the

Question 676909: A bridge charges cars 4.00 and trucks 6.00 to go over. If 200 vehicles go over the bridge and the toll operator collect 860 dollars how many of the vehicles were trucks? I know the answer is 30 trucks but how do I figure it out in a formula.
Answer by partha_ban(41) (Show Source): You can put this solution on YOUR website!
Let, t = number of trucks
Therefore number of cars = 200 - t
By condition,
4 * (200 - t) + 6t = 860
800 - 4t + 6t = 860
2t = 860 - 800
2t = 60
t = 60/2 = 30
Therefore, number of trucks were 30
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