# Chocholate pyramid

How many chocolates are in the third shelf when at the 8th shelf are 41 chocolates in any other shelf is 7 chocolates more the previous shelf.

Correct result:

x =  6

#### Solution:

a+7d = 41
d = 7
x = a+2d

a+7•d = 41
d = 7
x = a+2•d

a+7d = 41
d = 7
a+2d-x = 0

a = -8
d = 7
x = 6

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