Difficulty: Easy
Correct Answer: x, - and ÷
Explanation:
Introduction / Context:
We must choose a specific ordered trio of operations to place between 7, 4, 8, 2 so that the resulting expression equals 24. Standard operator precedence (× and ÷ before + and −) must be respected.
Given Data / Assumptions:
Concept / Approach:
Try options mentally while honoring precedence. Multiplication early tends to raise the value, and a final subtraction after a division can fine-tune to 24.
Step-by-Step Solution:
Verification / Alternative check:
Test other options quickly:
Why Other Options Are Wrong:
They either ignore precedence or yield values far from 24 when computed correctly with precedence.
Common Pitfalls:
Evaluating strictly left-to-right or misordering ×/÷ versus +/−, which changes the outcome.
Final Answer:
x, - and ÷ (i.e., 7 × 4 − 8 ÷ 2 = 24).
Discussion & Comments