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THE BIRTHDAY PARTY
THE BIRTHDAY PARTY
Leire invited ten friends to a birthday party. Once they have finished the lunch, she proposed a problem:
“If any of you guess how many chocolates are in the box without opening it, you would have it for you. To try to guess it I’ll give you some clues:
- There are less than five dozens.
- They are placed in lines of 9.
- If we share them between us, one would be left.”
How many chocolates are there in the box?
DON’T RAIN ON MY PARADE
DON’T RAIN ON MY PARADE
Some of the participants of one parede can be three by three, five by five or twenty-five by twenty five; but they can’t be placed no way four by four or nine by nine.
How many participants are there if we know that there are between 1000 and 1250 people?
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