Difficulty:
★★★☆☆
Problem:
Suppose there is a country whose currency is in only two denominations: $5 bills and $7 bills. What is the maximum amount that you cannot pay with these two types of bills?
Solution:
Tuesday, February 7, 2017
Monday, February 6, 2017
Apples
Difficulty:
★★★☆☆
Problem:
Al, Ben, Chris, and Don each took a number of apples from a bucket of 11 apples. Each person took at least one apple.
Al: Ben, did you take more apples than I did?
Ben: I don't know. Chris, did you take more apples than I did?
Chris: I don't know.
Having heard this conversation, Don was able to figure out exactly how many apples each person took. How many apples did Don take?
Solution:
★★★☆☆
Problem:
Al, Ben, Chris, and Don each took a number of apples from a bucket of 11 apples. Each person took at least one apple.
Al: Ben, did you take more apples than I did?
Ben: I don't know. Chris, did you take more apples than I did?
Chris: I don't know.
Having heard this conversation, Don was able to figure out exactly how many apples each person took. How many apples did Don take?
Solution:
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