Here’s a short but tricky brain teaser for today. At first glance, it seems very simple. But like many classic riddles, the answer is hidden in the wording — so read carefully.
Here’s the challenge:
There are 5 sisters in the room.
Ann is reading a book.
Margaret is cooking.
Kate is playing chess.
Marie is doing laundry.
So, what is the fifth sister doing?
Take a moment to think before scrolling down.
Many people assume she must be doing some different activity. But look closely.
Chess is not a one-person game.
…
..
.
The answer: The fifth sister is playing chess with Kate.
If Kate is playing chess, she must have an opponent. Since there are only five sisters in the room, the remaining sister is the one playing with her.
Did you catch the trick?
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Solve this math riddle from middle school
Recently, a new type of challenge has appeared on the net, although the quizzes themselves are not particularly new.
It’s about good old-school mathematics.
Trying this kind of challenge is exciting and fun, especially if it has been a bunch of years since you last went to school.
It’s important to think about it and try to remember those old rules of math your teacher kept writing on the chalkboard many years ago.
In addition, you must exercise your competitive instinct as well, which is always fun.
Can you figure out the solution for this math riddle – without a calculator?
Okay, now onto the challenge itself.
In the picture below, we see a mathematics problem made for middle schoolers.
The challenge: are you able to solve it without a calculator?
Remember the order of operations. What part should you solve first?
Think about it carefully so you answer correctly!
Below the next picture, you will find the correct answer.
A
B
C
Here’s the answer.
In evaluating the expression 6-1×0+3÷3, we use the PEMDAS mnemonic device, which tells us the correct operator precedence.
So applying theory to your question, we must evaluate the multiplication and division operations first, then the addition and subtraction. Therefore:
6-1×0+3÷3
= 6-(1×0)+(3÷3) [items within parenthesis are evaluated first]
= 6-0+1
= 7
The answer is then 7.
Did you get it right? Congratulations!