SOLUTION: a class of 165 students went on a field trip they took 9 vehicles some were cars and some were buses.find the number of cars and number of buses they took if each car holds 5 stude

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: a class of 165 students went on a field trip they took 9 vehicles some were cars and some were buses.find the number of cars and number of buses they took if each car holds 5 stude      Log On


   

Question 1026102: a class of 165 students went on a field trip they took 9 vehicles some were cars and some were buses.find the number of cars and number of buses they took if each car holds 5 students and each bus holds 45 students
Answer by addingup(3677) About Me  (Show Source):
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c+b = 9 subtract b both sides:
c = 9-b
5c+45b= 165 substitute for c
5(9-b)+45b = 165
45-5b+45b = 165
40b = 120
b = 3 there were 3 buses and
9-3= 6 cars
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Check:
3(45)+6(5) = 135+30 = 165 Correct