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2 answers:
There Were 6 Vans And 3 Buses.
6 x 13 = 78
3 x 40 = 120
120 + 78 = 198
Answer:
They used 6 vans and 3 buses
Step-by-step explanation:
x + y= 9
13x + 40y= 198
x= 9 - y
13(9 - y) + 40y= 198
117 - 13y + 40y= 198
27y= 81
y= 3
9-3= 6
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