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In April, there were 43 volunteers in a cleanup project. Each volunteer was asked to choose a small gift labeled...

GMAT Problem-Solving and Data Analysis : (PS_DA) Questions

Source: Practice Test
Problem-Solving and Data Analysis
One-variable data: distributions and measures of center and spread
EASY
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Notes
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In April, there were 43 volunteers in a cleanup project. Each volunteer was asked to choose a small gift labeled A, B, C, or D. The bar graph shows the number of volunteers who chose each gift. How many volunteers chose gift C?

[Bar graph showing Number of volunteers (y-axis, 0-20) vs Gift (x-axis, A, B, C, D). The bars show: A = 14, B = 8, C = 18, D = 3]

A
\(\mathrm{3}\)
B
\(\mathrm{8}\)
C
\(\mathrm{14}\)
D
\(\mathrm{18}\)
Solution

1. TRANSLATE what the question is asking

The question asks: "How many volunteers chose gift C?"

  • We need to find the number of volunteers represented by bar C in the graph

2. TRANSLATE the bar graph to get the answer

  • Look at the x-axis (horizontal) to locate the bar labeled "C"
    • The bars are arranged in order: A, B, C, D from left to right
  • Once you've identified bar C, look at its height
    • Follow the top of bar C horizontally to the y-axis
  • Read the value on the y-axis where the top of bar C aligns
    • The top of bar C reaches the line marked 18
  • Therefore, 18 volunteers chose gift C

Answer: 18 (Choice D)




Why Students Usually Falter on This Problem

Most Common Error Path:

Weak TRANSLATE skill - Reading the wrong bar:

Students who rush through the problem may look at the graph but accidentally read the height of a different bar instead of bar C. This happens when they don't carefully match the x-axis label to the correct bar.

  • Reading bar A (height 14) leads them to select Choice C (14)
  • Reading bar B (height 8) leads them to select Choice B (8)
  • Reading bar D (height 3) leads them to select Choice A (3)

Notice that each wrong answer choice corresponds exactly to the height of a different bar - this is intentional test design to catch careless errors.


The Bottom Line:

This problem tests fundamental graph literacy - the ability to accurately read information from a visual display. While conceptually simple, it requires careful attention to match the correct label (gift C) with its corresponding bar and accurately read the y-axis value. All three incorrect answer choices are trap answers corresponding to the other three bars, so precision in identifying bar C is essential.

Answer Choices Explained
A
\(\mathrm{3}\)
B
\(\mathrm{8}\)
C
\(\mathrm{14}\)
D
\(\mathrm{18}\)
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