Question

PLEASE HELP ME WITH THIS RIDDLE

Both of my parents gave me 250$ each and now I have 500$ and then I bought a phone for 450$ and now I have 50 dollars left so i gave my friend 30 dollars because he asked. Now I have 20$ left. Since I have 20$ left I’ll give my parents 10$ each and now they want from me 240$ each and in total I have 480$ to give to my parents but my friend gave my 30$ dollars back that I gave him and now I have 510$ where did that 10$ in the 510$ come from since I only got 500$ from my parents.

Answer 1

The problem is that at the end, you owe $480, so what you have is -$480 (instead of the $480 that is written on the riddle). And when your friend gives back the $30, you will owe $450, meaning that you have

-$450.

Where is the problem in the math?

Let's follow what you say with the proper equations.

Both your parents gave you $250, so now you have:

$250 + $250 = $500

Then you bought a phone for $450, so now you have:

$500 - $450 = $50

Then you gave $30 to your friend, so now you have:

$50 - $30 = $20

Then you gave $10 to each one of your parents, so now you have:

$20 - $10 - $10 = $0.

Now, each one of your parents wants the $240 ($250 - $10) back.

So you OWE $480 (you do not have $480, you owe it, here is the problem with the riddle reasoning).

It will be represented with a negative number:

-$480

When your friend gives you the $30 back, you add it to the above value (meaning that you give it to your parents):

-$480 + $30 = -$450

Now you owe $450 to your parents, which is the cost of the cellphone that you bought.

If you want to learn more about math reasoning, you can read:

https://brainly.com/question/25870256