Finally, how big is the difference,

But who is worse than who.

Is to find the difference between who and 10 five times,

So it is five times that of 99- 10.

It is 99- 10x5.

What is the five times of 10? You have to work it out first, and then subtract it from 99. First, calculate the following operation, and add (). Multiplication and division mix, calculate multiplication and division first, and omit ().

So the formula is 99- 10x5.

=99-50

=49