Challenge: Can you solve this math problem for middle schoolers – without a calculator?
Classic brain training methods are perhaps puzzles like crosswords or sudoku, but I have recently become more attracted to the type of challenge you’ll see below.
These puzzles have been flooding the web lately, probably because they are really fun!
These are old classic mathematical problems. When you were in middle or high school.
These math problems are more fun when you find yourself trying to remember the math you learned as a child.
Can you figure out the correct solution?
Here is the challenge, in the picture below.
At the top of the picture, we see the task and then four possible answers.
Which solution do you think is the correct one?
How did you come up with it?
Take your time and think about it to find the correct solution.
Done? Below you can check if you picked the right number!
A
B
C
The correct answer
The correct answer is B: 12.
Why is 12 the correct answer?
Well, if you remember from your school days, according to the order of operations, you do multiplication before addition and subtraction, so you start by solving 3 x 3, which results in 9.
Then we are left with a simpler math problem: 3 + 9 – 3 + 3
The answer is therefore 12.
Did you pick the correct number? Congratulations!
Put a Sheet of Aluminum Foil in Boiling Water, Even Wealthy People Do This: The Reason
An easy home remedy using an aluminum foil sheet turns out to be a fantastic way to bring antique silverware back to life. After a meal, it’s usually best to wash the dishes right away to avoid having a large pile in the sink.
Dishwasher owners could avoid this task, but hand washers, for a variety of reasons, face the difficulty of polishing aged and seemingly irreparably tarnished silverware.
To address this widespread problem, a clever solution that makes use of aluminum foil’s transformational properties is developed. To start, heat up some water in a pot and add a spoonful of sodium bicarbonate and half a spoonful of sugar.
After the mixture comes to a boil, cut an aluminum foil sheet in half to form four equal portions. After rolling each section into a ball, the aluminum balls are added to the boiling kettle.
Unexpectedly, this technique works well for revitalizing crockery. For just ten minutes, utensils, knives, and spoons that have lost their shine are submerged in the liquid.
After this quick treatment, the cutlery is taken out and cleaned with soap and water to finish the regeneration process. The striking outcome is that the once-dull cutlery now sparkles brilliantly, almost like it is brand-new.
This inexpensive fix, which makes use of aluminum foil’s potential and sodium bicarbonate’s cleaning capabilities, is a fantastic substitute for throwing away used silverware and buying new ones.
People can revitalize their kitchen basics and save money and resources by using this easy-to-use yet efficient technique. Through this clever combination of commonplace items, the cutlery’s original shine and purity are revived.
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