Each trip, a bus drops off more fans at a concert. On the first trip, the bus dropped off 30. On the 14th trip, which was the last one, the bus dropped off 95 fans. How many fans did the bus deliver to the concert in total?

Question

vera_ewing · Answer

@undeadknight26

jamierox4ev3r · Answer

it looks like each time, the bus picked up 5 more people

vera_ewing · Answer

I got 423 is that correct?

jamierox4ev3r · Answer

1-30
2-35
3-40
4-45
5-50
6-55
7-60
8-65
9-70
10-75
11-80
12-85
13-90
14-95

jamierox4ev3r · Answer

the number on the left is the trip, and the number on the right is the amount of people the bus picked up per trip.

jamierox4ev3r · Answer

So to find out how many people went to  the concert via bus, just add all the numbers on the right column.

undeadknight26 · Answer

Shes smart

jamierox4ev3r · Answer

pfft

vera_ewing · Answer

455 or 875 can you check please?

undeadknight26 · Answer

Add them all up hun

jamierox4ev3r · Answer

875 is what i got

sepeario · Answer

You can use sigma notation to do this too.

♪chibiterasu · Answer

This is an arithmetic sequence. The way Jamie did it is correct but there is usually a short way. There could be moments when the nth term is over 100 or 1000.

vera_ewing · Answer

Thank you @Jamierox4ev3r :)

♪chibiterasu · Answer

$$a_n = a_1 + (n - 1)d$$

You can use this equation for future problems with much larger terms.

♪chibiterasu · Answer

Which these shorter ones you can do the counting, I kind of do that too. :p