SOLUTION: Cartons are stacked in 16 rows with 4 cartons in the top row, 7in the second row, 10 in the next row, and so on. How many cartons are in the stack?

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Question 850191: Cartons are stacked in 16 rows with 4 cartons in the top row, 7in the second row, 10 in the next row, and so on. How many cartons are in the stack?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
n 16=(4+15*3)=49
16/2(4+49)
8*53=424
check
4+7+10+13+16+19+22+25+28+31 +34+37+40+43+46+49=424
ok