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Puzzle 1
How do you divide 50 kopecks?
Two friends were cooking porridge: one poured 200 g of grain into the pot, and the other poured 300 g. When the porridge was ready and the friends were about to eat it, a passerby joined them and shared the meal with them. He left them 50 kopecks as a tip.
How should the friends divide these 50 kopecks in proportion to the amount of grain each contributed? List the amounts in ascending order.
Enter your answer here
Answer
10
Puzzle 2
Barrels
Six barrels of kerosene were delivered to the store. The diagram shows how many buckets of kerosene were in each barrel. On the very first day, there were two customers; one bought two whole barrels, and the other bought three, with the first person buying half as much kerosene as the second. So they didn’t even have to open the barrels. Of the six barrels in the warehouse, only one remained. Which one?
15-bucket
31-bucket
19-bucket
20-bucket
16-bucket
18-bucket
Answer
10
Puzzle 3
Grandfather and Grandson
— What I’m about to tell you took place in 1932. At the time, I was exactly as old as the last two digits of the year of my birth. When I told my grandfather about this correlation, he surprised me by saying that the same thing held true for his age. It seemed impossible to me...
— Of course it’s impossible, — someone’s voice interjected.
“Imagine that—it’s entirely possible. My grandfather proved it to me. How old was each of us?”
