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If n books cost r rupees. Then how much will m books cost?

Correct answer: D. mr/n

  • A. mr
  • B. nr
  • C. nr/m
  • D. mr/n

Explanation

If n books cost r rupees, you can find the cost of m books using the concept of proportionality. The cost of books is directly proportional to the number of books. The proportionality constant is the cost per book. Let c be the cost of one book. So, n books cost r rupees can be written as: n.c=r Now, to find the cost of m books, set up the proportion: n/m=r/x Where x is the cost of m books. Cross-multiply to solve for x: n . x= m. r Now, divide both sides by n to find the cost of one book (c): x=mr/n

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About Quantitative Reasoning

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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