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Papessa [141]
4 years ago
14

Sophia's school took a field trip. a total of 21 vehicles were needed for the trip. some students took the bus, and some student

s 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?
Mathematics
1 answer:
Liono4ka [1.6K]4 years ago
4 0
Let x be the number of buses, and y the number of cars.
\left \{ {{x+y=21} \atop {30x+4y=318}} \right.
We can solve for y in the first equation to get:
y=21-x
Now we can replace 21-x in our second equation, and solve for x:
30x+4(21-x)=318
30x+84-4x=318
26x=234
x= \frac{234}{26}
x=9

We can conclude that 9 buses were needed for the trip.
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