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Question 23

A mosaic uses brass, silver, and black pieces in the ratio 1:2:5. What fraction of the pieces are black?

  1. 5/2
  2. 5/8Bonne réponse
  3. 3/8
  4. 1/5

Explication

The ratio has 1 plus 2 plus 5, or 8, parts altogether, and 5 of those parts are black, giving 5/8. The fraction 5/2 compares black pieces only with silver pieces and is not a share of the entire mosaic.

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Question 23: A mosaic uses brass, silver, and black pieces in the ratio… · Ratios and Proportions · Questena