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Seven piles of bricks are placed side by side so that their tops form steps 1 brick high. If the lowest pile contains 9 bricks, how many bricks are being used altogether?
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Seven piles of bricks are placed side by side so that their tops form steps 1 brick high. If the lowest pile contains 9 bricks, how many bricks are being used altogether?

User Stony
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If the lowest pile contains 9 bricks, the next pile contains ten bricks, the next contains eleven, and so on until the greatest contains 15 bricks.  The sum is thus 9+10+11+12+13+14+15=84.
User Elton
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