Let X, Y, and Z denote the number of international students, in thousands, that Company U predicted would be studying...
GMAT Two Part Analysis : (TPA) Questions
Let \(\mathrm{X}\), \(\mathrm{Y}\), and \(\mathrm{Z}\) denote the number of international students, in thousands, that Company U predicted would be studying in the United States (US) during the school years 2014–2015, 2019–2020, and 2024–2025, respectively. The average (arithmetic mean) of \(\mathrm{X}\), \(\mathrm{Y}\), and \(\mathrm{Z}\) is \(1{,}128\), and \(\mathrm{Y} = 1{,}124\). Company U predicted that there would be more international students studying in the US during the 2024–2025 school year than during the 2014–2015 school year.
In the table, identify a value of X and a value of Z that are jointly consistent with the information provided. Make only two selections, one in each column.
Phase 1: Owning the Dataset
Visual Representation
Let's use a timeline to show the progression of international students:
2014-2015 -------- 2019-2020 -------- 2024-2025 X Y=1,124 Z ? ? Constraint: Z > X (increasing trend)
Given Information
- X = international students in 2014-2015 (in thousands)
- Y = international students in 2019-2020 = 1,124 thousand
- Z = international students in 2024-2025 (in thousands)
- Average of X, Y, and Z = 1,128
- Z > X (more students predicted in 2024-2025 than 2014-2015)
Phase 2: Understanding the Question
Key Mathematical Relationship
From the average formula:
- \(\mathrm{(X + Y + Z) ÷ 3 = 1,128}\)
- \(\mathrm{X + Y + Z = 3,384}\)
- Substituting Y = 1,124: \(\mathrm{X + 1,124 + Z = 3,384}\)
- Therefore: \(\mathrm{X + Z = 2,260}\)
Constraints Summary
We need to find X and Z such that:
- \(\mathrm{X + Z = 2,260}\)
- \(\mathrm{Z > X}\) (growth constraint)
- Both X and Z must be from the given choices
Phase 3: Finding the Answer
Systematic Check
Let's check each possible value for X:
If X = 910:
- \(\mathrm{Z = 2,260 - 910 = 1,350}\)
- Is 1,350 in our choices? Yes ✓
- Is Z > X? Is 1,350 > 910? Yes ✓
- Stop here - we found our answer
Our verification:
- \(\mathrm{X + Z = 910 + 1,350 = 2,260}\) ✓
- \(\mathrm{Average = (910 + 1,124 + 1,350) ÷ 3 = 3,384 ÷ 3 = 1,128}\) ✓
- \(\mathrm{Z > X: 1,350 > 910}\) ✓
Phase 4: Solution
Final Answer:
- X = 910
- Z = 1,350
These values satisfy all requirements: they sum to 2,260, maintain the average of 1,128, and show growth from 2014-2015 to 2024-2025.