Brain Teasers
Mail Delivery
Aly lives in a street with 12 houses. Every day she gets more letters than are delivered to any other house. Today 57 letters were delivered to her street. What is the smallest number of letters that Aly could have received today?
Answer
6 letters.For Aly to receive the least amount of letters, the deliveries had to be spread out as evenly as possible amongst the 12 houses. The nearest multiple of 12 below 57 is 48 (4 letters per house). This leaves 9 letters. If seven people each receive one more letter and Aly receives two more letters, then this is the minimum that she could receive: six letters.
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