If the only frying pan in the house is large enough to cook two pancakes at a time and pancakes take one minute to brown one side, how can you make three pancakes in three minutes?
Pour two pancakes and brown the first side. After the first side is done, flip one, take the second off, and pour the third pancake. After another minute, take the first one off, flip the third one, and put the second one back on. Cook both pancakes until finished.
A young man decides to buy a collector's baseball card. He pays $60 for it. After a month, the value of the card has increased to $70 and he decides to sell it. But already a few days later he regrets his decision to sell the collector's item, and he buys it again. Unfortunately he has to pay $80 to get it back, so he loses $10. After a year of owning the baseball card, he finally decides to sell it for $100. What is his overall profit?
A certain number has three digits. The sum of the three digits equals 36 times this number. Seven times the left digit plus 9 is equal to 5 times the sum of the two other digits. 8 times the second digit minus 9 is equal to the sum of the first and third. What is the number?