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Puzzle 1
Book Prices
Ivanov buys all the books he needs from a bookseller he knows at a 20% discount. As of January 1, the prices of all books have increased by 20%. Ivanov decided that he would now pay for books the same amount that other customers paid before January 1. Is he right? Write down what percentage of the book’s price Ivanov will pay.
Enter your answer here
Answer
10
Puzzle 2
Chicken and duck eggs
The baskets contain eggs—some are chicken eggs, others are duck eggs. The number of eggs is 5, 6, 12, 14, 23, or 29. “If I sell this basket,” the merchant muses, “I’ll have exactly twice as many chicken eggs left as duck eggs.” Which basket did he have in mind?
5
6
12
14
23
29
Answer
10
Puzzle 3
Non-convertible banknotes
A woman had several $1 bills in her purse. She didn't have any other money with her.
She spent half of her money on a new hat and used one dollar to buy a refreshing drink.
When she went into a café for breakfast, she spent half of the money she had left and paid another $2 for cigarettes.
With half of the money she had left after that, she bought a book, then stopped at a bar on her way home and ordered a $3 cocktail. In the end, she had $1 left.
How many dollars did the woman have to begin with, assuming she never had to break any of her bills?
