If 'X' means '+', 'Y' means '-', 'Z' means 'x', and 'W' means '÷' what is the value of the following expression?
15 W 3 X 2 Y 4 = ?

The correct answer is 3.

To find the value of the given expression, we first replace each letter with its corresponding mathematical operation as defined in the question:

• 'W' means '÷'
• 'X' means '+'
• 'Y' means '-'
• 'Z' means '×'

Given expression:

15 W 3 X 2 Y 4 = ?

Substituting the signs into the expression, we get:

$15÷3+2-4$

Now, we solve the expression using the standard order of operations (BODMAS / PEMDAS), which prioritizes division and multiplication before addition and subtraction.

Step 1: Perform Division

$15÷3=5$

Substituting this back into the expression yields:

$5+2-4$

Step 2: Perform Addition

$5+2=7$

Substituting this back yields:

$7-4$

Step 3: Perform Subtraction

$7-4=3$

Thus, the value of the expression is 3.