AlgebraHardEquation with decimal coefficients
Algebra practice question
What value of x satisfies 0.3(x − 20) = 0.5x − 12?
Answer: 30
0.3x − 6 = 0.5x − 12, so 6 = 0.2x and x = 30.
Common wrong answers
- If you answered 20
- 20 makes the left side 0 but the right side −2.
- If you answered 90
- 90 comes from treating 0.3 × 20 as 18.
- If you answered -30
- −30 has the sign of 6 reversed.
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