If 2m=4x and 2w = 8x, what is m in terms of w?
Correct answer: A. w - 1
- A. w - 1
- B. w + 1
- C. 2w - 1
- D. 2w + 1
Explanation
To determine m in terms of w, we first rewrite the equations with the same base.Given: 2^m = 4x 2^w = 8xConvert 4x and 8x into powers of 2: 4x = 2^2 * x 8x = 2^3 * xDivide the two equations: (2^m) / (2^w) = (4x) / (8x)Simplify the right side: (4x) / (8x) = 1/2So: 2^(m - w) = 1/2Write 1/2 as a power of 2: 1/2 = 2^(-1)Thus: m - w = -1Therefore: m = w - 1Other options (w + 1, 2w - 1, and 2w + 1) suggest incorrect relationships as they imply different mathematical connections between m and w based on the original equations.
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Quantitative reasoning applies arithmetic and basic algebra to numerical relationships, including percentages, ratios, averages, fractions, proportions, profit and loss, rates, time, work and measurement. Questions focus on translating words into equations, choosing an efficient method and checking whether the result is numerically reasonable.
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