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Five coffee–chicory blends—J, K, L, M, and N—are all priced differently. The blends are such that the greater the proportion...

GMAT Data Sufficiency : (DS) Questions

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Data Sufficiency
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Five coffee–chicory blends—J, K, L, M, and N—are all priced differently. The blends are such that the greater the proportion of coffee, the more expensive the blend—and the greater the proportion of chicory, the stronger the flavor of the blend. If the five blends were ranked in order of cost per kilogram, which would fall in the middle?

  1. Blend L has a higher proportion of coffee than the other blends except for Blend M.
  2. Blend K and Blend N both have a stronger flavor than Blend J.
A
Statement (1) ALONE is sufficient but statement (2) ALONE is not sufficient.
B
Statement (2) ALONE is sufficient but statement (1) ALONE is not sufficient.
C
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D
EACH statement ALONE is sufficient.
E
Statements (1) and (2) TOGETHER are not sufficient.
Solution
## Understanding the Question

We have 5 coffee-chicory blends (J, K, L, M, and N), each priced differently. The key relationships are:
- More coffee → More expensive
- More chicory → Stronger flavor

Since coffee and chicory together make 100% of each blend, we can deduce:
- More expensive blends = More coffee = Less chicory = **Weaker** flavor
- Less expensive blends = Less coffee = More chicory = **Stronger** flavor

**Our task**: When the 5 blends are ranked by cost from most to least expensive, which blend occupies position 3 (the middle)?

For a statement to be **sufficient**, it must allow us to definitively identify which specific blend is in the 3rd position.

## Analyzing Statement 1

Statement 1 tells us: "Blend L has a higher proportion of coffee than the other blends except for Blend M."

This translates to:
- M has the most coffee → M is most expensive (position 1)
- L has the second most coffee → L is second most expensive (position 2)
- J, K, and N have less coffee than L → They occupy positions 3, 4, and 5

Our partial ranking: M (1st), L (2nd), then J, K, and N somewhere in positions 3-5.

**The problem**: We don't know the relative order of J, K, and N. Any of these three could be in position 3.
- If J > K > N, then J is 3rd
- If K > J > N, then K is 3rd
- If N > J > K, then N is 3rd

Since we cannot identify which specific blend is 3rd, Statement 1 is **NOT sufficient**.

**[STOP - Not Sufficient!]** This eliminates choices A and D.

## Analyzing Statement 2

**Important**: We now analyze Statement 2 independently, forgetting Statement 1 completely.

Statement 2 tells us: "Blend K and Blend N both have a stronger flavor than Blend J."

Since stronger flavor = more chicory = less coffee = less expensive:
- J has weaker flavor than K → J has more coffee than K → J is more expensive than K
- J has weaker flavor than N → J has more coffee than N → J is more expensive than N

This gives us: \(\mathrm{J} > \mathrm{K}\) and \(\mathrm{J} > \mathrm{N}\) (in terms of cost).

**What we still don't know**:
- Where J ranks compared to L and M
- The relative order of K and N
- Which position (1st through 5th) any blend occupies

J could be anywhere from 1st to 3rd position. For example:
- If \(\mathrm{M} > \mathrm{L} > \mathrm{J} > \mathrm{K} > \mathrm{N}\), then J is 3rd
- If \(\mathrm{J} > \mathrm{M} > \mathrm{L} > \mathrm{K} > \mathrm{N}\), then L is 3rd
- If \(\mathrm{M} > \mathrm{J} > \mathrm{L} > \mathrm{K} > \mathrm{N}\), then L is 3rd

Since we cannot determine which blend is in position 3, Statement 2 is **NOT sufficient**.

**[STOP - Not Sufficient!]** This eliminates choice B.

## Combining Statements

Now let's combine both statements.

**From Statement 1**:
- Position 1: M (most expensive)
- Position 2: L
- Positions 3, 4, 5: J, K, and N (in some order)

**From Statement 2**:
- J is more expensive than both K and N

**Combining the information**: 
Since J must occupy position 3, 4, or 5 (from Statement 1), and J is more expensive than both K and N (from Statement 2), J must be the most expensive among these three blends. Therefore:

- Position 3: **J**
- Positions 4 and 5: K and N (in either order)

The complete ranking becomes: M (1st), L (2nd), **J (3rd)**, then K and N in positions 4 and 5.

**[STOP - Sufficient!]** The combined statements allow us to determine that **J is the blend in the middle position**.

## The Answer: C

Neither statement alone tells us which blend is in the middle, but together they provide enough information to determine that J occupies the 3rd position.

**Answer Choice C**: "Both statements together are sufficient, but neither statement alone is sufficient."
Answer Choices Explained
A
Statement (1) ALONE is sufficient but statement (2) ALONE is not sufficient.
B
Statement (2) ALONE is sufficient but statement (1) ALONE is not sufficient.
C
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D
EACH statement ALONE is sufficient.
E
Statements (1) and (2) TOGETHER are not sufficient.
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