9,900 because u would see if 2 is greater than 5 which it's not so because the nine was in the hundreds spot you keep it the same and make everything behind it 0
The questions should be in english here
The saying means what is considered good is in fact bad and what is considered bad is actually good.
an example could be you trust someone and they seem to be a good person but looks are deceiving and they turn out to be bad