The Core Question
Is the total time to sell a box of products more than 10 hours?
• First, let’s simplify. 10 hours is 600 minutes.
• Let N be the number of products and R be the rate (time per product).
• The question is: Is N * R > 600?
1. Analyze Statement (1)
• Statement: Each box has more than 20 products (N > 20).
• Test with Smart Numbers:
• We have no idea about the rate (R).
• Statement (1) is Insufficient.
2. Analyze Statement (2)
• Statement: Harry’s rate is less than 30 minutes per product (R < 30).
• Test with Smart Numbers:
• We have no idea about the number of products (N).
• Statement (2) is Insufficient.
3. Combine Statements (1) and (2)
• Combined Info: N > 20 and R < 30.
• The “Boundary” Trap: Notice that 20 * 30 = 600. This is a classic GMAT trap! It makes you think the answer is C. But the values are strictly more than 20 and less than 30.
• Test the Boundaries:
• Can we get a “No”? (Time < 600): Let’s pick numbers to keep the total time low. Since N must be an integer, let N = 21. Let’s pick a rate far below 30, say R = 20 mins/product. Total time = 21 * 20 = 420 minutes. Is 420 > 600? No.
• Can we get a “Yes”? (Time > 600): Let’s pick numbers to push the time up. Let N = 21. Pick a rate close to 30, say R = 29 mins/product. Total time = 21 * 29 = 609 minutes. Is 609 > 600? Yes.
• Conclusion: Even together, the statements don’t give a definite answer. We can get both a “Yes” and a “No.”
The final answer is E.