Solve: 20-(0÷4×3)+1 Using Order of Operations

Let's simplify this expression while following the order of operations which states that exponents come before multiplication and division, which come before addition and subtraction, and that parentheses come before all of these,

Since multiplication and division come before addition and subtraction, we'll first calculate the numerical value of the second term from the left, note that between division and multiplication operations there is no precedence derived from the aforementioned order of operations, therefore we'll perform the operations one after another from left to right - this is the natural order of operations, we'll also remember that dividing 0 by any number (except 0) will yield 0, and similarly - multiplying 0 by any number will yield 0:

$20-0:4\cdot3+1= \\ 20-0\cdot3+1=\\ 20-0+1= \\ 21$

Therefore the correct answer is answer A.