Answers to Brain Teasers

Are you sure that you want to peek at the answers to the brain teasers? It's very tempting to peek at the answers, I know. It's almost like reading the end of a book before you have reached it. (I have often found myself fighting that curiosity.)

So, if you have solved the brain teasers and wish to check your answers, feel free to proceed. But if you didn't quite manage to solve the brain teasers, here are some tips that may help you:

1. Try to change the direction of your thought. (Sometimes our regular way of thinking restricts us.)

2. Take a break from the problem and return to it in a few days. A new perspective in a few days time will enable you to see the problem in a different light.

In any case, both the answers to brain teasers and I will await your return...

Are you back? Great!

Whether you managed to solve the brain teasers by yourself, or whether you need a little help, I for one am really happy to meet you here once again.

Here are the answers to the math brain teasers:

Number sequence

Magic square

Family problem

The two sons and the two fathers are: a grandfather, a father and a son. The grandfather and father are the two fathers, and the father and the son are the two sons. So in fact, all together there are three people.

Total of 15

Discover the number

What is the connection?

The third number (marked in red) in each of the circles is half of the amount of the two other numbers. In order to find the missing number, you have to do the following exercise:
(63 + 17) : 2 = 40

Shapes and numbers

The solution to this problem lies in choosing the first exercise. Once you know which exercise to begin with all else becomes simple. Here is the exercise that you should begin with:

Which two numbers when added together give the same answer? That's right! 0



The next exercise will be:



Which number when divided by it, will leave the other number unchanged? 1

Now it is easy to recognize the remainder of the numbers.

Crossing the river

The man will take the cat to the other side of the river, will leave him there and return to get the mouse.

When he arrives with the mouse to the other side of the river, he will take the cat back with him, leaving the mouse alone and taking the cat back with him towards the dog.

He will leave the cat there and take the dog across the river, and finally, will return to get the cat.

What is the missing number?

The orange thief

7 oranges

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Around the world

Maya lives in Canada.
Carol lives in China.
Dana lives in England.

Going on a trip

Ben is eating a jelly sandwich.
Ron has a torch.

Changing direction

Place circle number 7 to the left of circle number 2.
Place circle number 10 to the right of circle number 3.
Place circle number 1 on the point between circle number 8 and circle number 9.

Limited time

Turn over both hour glasses simultaneously. After 6 minutes when one of the hour glasses completes its cycle it should be turned until the 8 minute hour glass completes its cycle, in order for it to time an additional two minutes. Now turn the 6 minute hour glass once again to time the final two minutes.

Taking out the trash

Move line number 2 right, and line number 1 parallel to number 4.

Five x's

Place match number 5 on match number 2.
Place match number 7 on match number 10.

Place match number 3 on match number 8.

Place match number 1 on match number 4.
Place match number 6 on match number 9.

Joining the dots

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