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GMAT Data Insights · Question of the Day

GMAT Data Insights Question of the Day

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Monday, September 21, 2026

A software development team tracks bugs found in their application. Bugs are classified as either Critical, Major, or Minor. The team wants to know the ratio of Critical bugs to Major bugs discovered last month. What is this ratio? (1) Critical bugs represented 25% of all bugs found, Major bugs represented 45% of all bugs found, and Minor bugs represented the remaining 30%. (2) The total number of bugs found was 80, with 20 Critical bugs discovered.

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A software development team tracks bugs found in their application. Bugs are classified as either Critical, Major, or Minor. The team wants to know the ratio of Critical bugs to Major bugs discovered last month. What is this ratio? (1) Critical bugs represented 25% of all bugs found, Major bugs represented 45% of all bugs found, and Minor bugs represented the remaining 30%. (2) The total number of bugs found was 80, with 20 Critical bugs discovered.

  1. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question.
  2. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  3. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
  4. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. (correct answer)

Explanation: When you encounter GMAT Data Sufficiency questions asking for ratios, focus on whether you can determine the relationship between the two quantities, not necessarily their absolute values. The question asks for the ratio of Critical bugs to Major bugs. Let's examine each statement: Statement (1) tells us that Critical bugs were 25% of all bugs and Major bugs were 45% of all bugs. Since we're looking for a ratio, we can express this as CriticalMajor=25%45%=2545=59\frac{\text{Critical}}{\text{Major}} = \frac{25\%}{45\%} = \frac{25}{45} = \frac{5}{9}. The percentages give us the exact ratio regardless of the total number of bugs, making this statement sufficient. Statement (2) provides 20 Critical bugs out of 80 total bugs. While we know the total and the number of Critical bugs, we cannot determine how many Major bugs there were without knowing how the remaining 60 bugs were split between Major and Minor categories. This statement alone is insufficient. Looking at the answer choices: (A) is incorrect because statement (1) alone is sufficient. (B) is wrong because statement (2) alone cannot determine the ratio without knowing the Major bug count. (C) is incorrect since we don't need both statements when statement (1) works alone. Therefore, (D) is correct: Statement (1) alone is sufficient, but statement (2) alone is not. Study tip: In ratio problems, percentages or proportions often provide sufficient information even without absolute numbers, while raw counts typically require complete information about all categories involved.