Difficulty: Easy
Correct Answer: None of these
Explanation:
Introduction / Context:
Here you translate a verbal condition into a simple linear equation and then compute a requested fraction of the found number. This checks your comfort with algebraic manipulation and careful reading—especially verifying that the requested final quantity appears among the options.
Given Data / Assumptions:
Concept / Approach:
Solve the linear equation to get N. Then compute the requested fraction 2N/3. Always compare the derived value to the choices; if it is not listed explicitly, the correct selection is “None of these.”
Step-by-Step Solution:
Start: N − 48 = N/3.Rearrange: N − N/3 = 48 → (2N/3) = 48.Therefore, 2N/3 = 48 immediately.Hence N = (48 * 3)/2 = 72, and two-thirds of N is 48.
Verification / Alternative check:
Check the original statement with N = 72: 72 − 48 = 24 and N/3 = 24, consistent. Thus 2N/3 = 48 is correct.
Why Other Options Are Wrong:
24, 72, and 36 represent N/3, N, or other misread values. Since 48 (the true two-thirds) is not among the listed options, “None of these” is the only correct choice.
Common Pitfalls:
Selecting 72 (the value of N) instead of two-thirds of N; stopping at N without computing the asked quantity; overlooking that the exact computed result is absent from the choices.
Final Answer:
None of these
Discussion & Comments