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How many blocks should she put on the bottom row?

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Jagrati is playing with building blocks. She decides to stack the blocks so that each row has one less than the row below. There are a total of 55 blocks and Jagrati wants just one block on top.
How many blocks should she put on the bottom row?

posted Feb 11, 2015 by Aman

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1 Answer

+3 votes

10 blocks is the answer

answer Feb 11, 2015 by Jaspalsingh Parmar
last row 10
last but one row(prev-1)=9
so 10+9+8+7+6+5+4+3+2+1=55
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