What is the value of the expression $50 - 40 + 60 - 30$ ?

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Solution

The correct option is B 40
Order of operations for solving a mathematical expression that we must follow is:
$P \to Parenthesis E \to Exponents M \to Multiplication D \to Division A \to Addition S \to Subtraction$

The expression $50 - 40 + 60 - 30$ contains only subtration and addition operations.
As subtraction and addition are equally weighted, we perform the operation from left to right.

Let's solve one by one.
$50 - 40 + 60 - 30 = 10 + 60 - 30$
(Similarly, we solve the next operation, starting from the left)
$= 10 + 60 - 30 = 70 - 30$
$= 40$

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