SOLUTION: There are 5 rows of blocks. In each row there is one more block than the last row. There are 15 blocks right now. How many blocks all together will you have if you have 10 rows?

Question 682011: There are 5 rows of blocks. In each row there is one more block than the last row. There are 15 blocks right now. How many blocks all together will you have if you have 10 rows?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
There are 5 rows of blocks. In each row there is one more block than the last row. There are 15 blocks right now. How many blocks all together will you have if you have 10 rows?
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1 row: 1
2 rows: 1+2 = 3
3 rows: 1 + 2 + 3 = 6
4 rows: 1 + 2 + 3 + 4 = 10
5 rows: 1 + 2 + 3 + 4 + 5 = 15
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Your Problem:
10 rows: 1 + 2 + 3 + 4 + ...+ 8 + 9 + 10
= 5*11 = 55 blocks
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Cheers,
Stan H.
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