Brain Teasers & Puzzles
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There is a box that is locked with a combination lock. The lock has four dials, each with digits from 0 to 9. The combination follows these rules:
The sum of all digits is 15.
The first digit is greater than the second digit.
The third digit is twice the fourth digit.What could be the combination?
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A chef has three ingredients: flour, sugar, and butter. He needs to prepare a cake with the following conditions:
1. Use exactly twice as much flour as sugar.
2. Use exactly half as much butter as sugar.
3. The total weight of all ingredients should be 600 grams.How much of each ingredient should he use?
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In a garden, there are five trees in a row. Each tree is either an apple tree or an orange tree. The first tree is an apple tree. If an apple tree is immediately followed by an orange tree, then the next tree after the orange tree must be an apple tree. How many possible arrangements of the five trees are there?
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