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heyhey1231 heyhey1231
  • 27-07-2015
  • Mathematics
Answered

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?

Verified Answer :

JaySL JaySL
  • 27-07-2015

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.

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