[For Seniors] Exercise Your Brain with Fun Logic Puzzles!
This time, we’re introducing logic puzzles you can enjoy as a recreational activity!
A logic puzzle is one where you carefully read the problem statement, look for clues within the text, and use them to arrive at the answer.
Unlike quizzes that rely solely on knowledge, and different from riddles that hinge on flashes of inspiration, these puzzles have their own unique flavor.
Depending on the problem, there may be elements of calculation or trick questions, making them great for a mental workout.
Why not try answering with a free and flexible mindset, without overthinking it?
Logic puzzles tend to have longer statements, but this time we’ve prepared shorter ones.
Please feel free to use them as brain training for older adults.
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[For Seniors] Let's Do Brain Training with Fun Logic Puzzles! (1–10)
There were three boxes: one with apples, one with pears, and one with either apples or pears. The labels that made the contents clear were all switched. Which box should you open to figure out the contents of the other two boxes?
See the answer
Apples and pears
Let’s focus on the fact that all the labels have been switched. For example, consider the case where the contents of either the apple-labeled box or the pear-labeled box are pears. Since all the labels are wrong, the box labeled “Apples” contains pears. In that case, the remaining box labeled “Pears” contains either apples or pears.
If you eat 5 candies, you receive a new candy. Taro has 100 new candies. How many candies can Taro eat in total?
See the answer
124 pieces
Since you get 1 candy for every 5 you eat, you might calculate that you can eat 20 in total. But let’s think further. If you eat those 20 candies you received, you’ll get 4 more, right? The problem asks for the total number of candies you can eat, so the correct answer is 124, which is 100 + 20 + 4.
There are cells that double every minute. In a certain container, if they keep multiplying, they will run out of space and stop growing after one hour. If you start with two cells in the same container, after how many minutes will the space be full and the growth stop?
See the answer
59 minutes
A single cell doubles to two cells in one minute. Since the problem states that it starts from two cells, you subtract the first minute from 60 minutes. With two cells, you might be tempted to answer that “the container will be full in 30 minutes.” It’s a question where thinking deeply is the key!
[For Seniors] Let’s Exercise Your Brain with Fun Logic Puzzles! (11–20)
There are two snails in front of a snail. There are also two snails behind a snail. There is one snail in the middle as well. How many snails are there in total?
See the answer
three animals
It’s the idea that there are two snails in front of the one at the very back, and two snails behind the one at the very front. You might be tempted to answer five, but it may be easier if you picture all the snails as a whole. Carefully reading the problem statement is also key.
Out of four cream-filled buns, exactly one has wasabi inside instead of cream. If two people eat them alternately, who has the lower probability of ending up with the wasabi bun—the first eater or the second?
See the answer
second attack
You’d think the odds are the same whether you go first or second, right? In this case, going second is actually advantageous. For example, if you eat three and it turns out to be the cream-filled bun, then the last one will be the wasabi-filled bun. Since you already know the answer, the second player can choose not to eat the wasabi-filled bun.
There are eight coins that look identical. However, one of them is a counterfeit coin and is slightly lighter than the real ones. Using a balance scale that compares the weights of the left and right sides, we need to find the counterfeit. How many weighings on the balance scale are necessary to determine it?
See the answer
twice
It may look like a complicated problem, but you can find the counterfeit in just two weighings. Place three coins on each side of the balance; if they balance, the remaining two coins contain the counterfeit. If one side is lighter when weighing three vs. three, weigh again using the three lighter coins. The method is: weigh two of those three on the balance; if they balance, the unweighed coin is the counterfeit. If they don’t balance, the lighter coin on the balance is the counterfeit. Thinking of it as “an efficient way to find the lighter coin” might add a game-like element and make it more fun.
One fox heading to the forest saw seven squirrels. The seven squirrels saw four kangaroos heading to the forest. Each of the four kangaroos had one joey in its pouch. How many animals are heading to the forest?
See the answer
9 animals
If you add up the animals that appear in order, you get 15, right? It’s a trick question that makes you fixate on listing and adding the animals. In fact, if you read the problem carefully, it doesn’t say the squirrel is “heading to the forest.” Therefore, the correct answer is 9: one fox, plus four kangaroos and the joeys in each of their pouches.