AFQT Plan

AFQT practice question: Mathematics Knowledge (MK)

Mathematics Knowledge (MK)Difficulty 2/5

Solve for x: 3(x − 4) = 2x + 1

  1. A11
  2. B13
  3. C−13
  4. D5
Show answer and rationale

Correct: B. Distribute: 3x − 12 = 2x + 1. Subtract 2x: x − 12 = 1. Add 12: x = 13.

  • D — 5 results from forgetting to distribute the 3 to −4.
  • A — 11 results from writing the right side as 2x − 1 instead of 2x + 1.
  • C — −13 reverses the sign in the final step.

Concept being tested

Algebra and geometry — solving equations and inequalities, exponents, factoring, angles, area/perimeter/volume, number properties. Counts once in the AFQT. P&P 25 questions / 24 minutes. — 25% of the exam. Study guide for Mathematics Knowledge (MK).

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Primary references

  1. What to Expect — CAT-ASVAB and paper-and-pencil subtests, counts and time limits — Official ASVAB (U.S. Department of Defense) · government · retrieved 2026-09-21, verified 2026-09-21
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