Abus makes a stop at 2: 30,letting off 15 people and letting on 9.the bus makes another stop ten minutes later to let off 4 more people. how does the number of people on the bus after the second stop compare to the number of people on the bus before 2: 30 stop?

Whatever the initial number of people in the bus was, we know that this number underwent the following transformations: after the first stop, we have

After the second stop, we have

So, globally, there are 10 people less at the end.

21/58.

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