a stack of firewood has 28 pieces on the bottom row,24 on the top of those,then 20 ,and so on.If there are 108 pieces of wood.How many rows are there?

Answer 1

well you could solve it the long way

28
24
20
16
12
8
4
add um all up=112
108 is 4 less so subtract the last row,

6 rows

there is some equation that is soposed to be faster, but seeing as all that took me 40 seconds aprox. WELL