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Sophia's school took a field trip. a total of 21 vehicles were needed for the trip. some students took the bus, and some students car-pooled. there were 30 people on each bus and 4 people in each car.
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Feb 13, 2018
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Sophia's school took a field trip. a total of 21 vehicles were needed for the trip. some students took the bus, and some students car-pooled. there were 30 people on each bus and 4 people in each car. 318 people altogether attended the trip. how many buses were needed for the trip?
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high-school
Ppapapetrou
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Let x be the number of buses, and y the number of cars.
We can solve for y in the first equation to get:
Now we can replace 21-x in our second equation, and solve for x:
We can conclude that 9 buses were needed for the trip.
Jake Ball
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Feb 20, 2018
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