Question 1026102
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