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Sagot :
Answer
D.42
Step-by-step explanation:
It's pretty easy and hard at the same time just do not overthink it. Obviously, the bus leaves with R occupants including the driver but that still means that there are occupants, to begin with. Now remembering that 3 people get on each stop you can take it to multiply 3*10 (3 people, ten stops) you would get thirty. Would this be the answer? NO! Remember that you began with R occupants to begin with and either using the process of elimination or common sense you can conclude that 12,24 are improbable answers because they are lower than thirty, and what about thirty? No, because you had thirty people in addition to the original occupants so that eliminates thirty. What's left?
42
There Is Your Answer
Answer:
- D. 42
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Given
- The bus has initially R occupants,
- At each stop the occupants increase by 3,
- After 20 stops there are 3 times more occupants than after 4 stops.
To find
- The number of occupants after 10 stops
Solution
Let's find out the how many occupants are there after 20 and 4 stops, then compare:
After 20 stops:
- R + 3*20 =
- R + 60
After 4 stops:
- R + 3*4 =
- R + 12
Compare and solve for R:
- R + 60 = 3(R + 12)
- R + 60 = 3R + 36
- 3R - R = 60 - 36
- 2R = 24
- R = 12
We found the number of initial occupants.
Use this to find the number of occupants after 10 stops:
- 12 + 3*10 =
- 12 + 30 =
- 42
Correct answer choice is D.
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