Xiao Li sees a pile of steel pipes in the warehouse. There are 15 steel pipes at the bottom layer. There is one difference between each two adjacent layers. There are 8 steel pipes at the top layer. How many steel pipes are there in this pile?

15+14+13+12+.+8
The general term formula of summation with arithmetic sequence
We get (15 + 8) * 8 / 2 = 92
There are 92

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