A product is sold in three sizes: 330 g for R9, 660 g for R17 and 1000 g for R28. Which size is the cheapest per gram?

Answer and explanation

Correct answer: A. 660 g for R17

  1. Step 1: Divide each price by its mass: R9/330 g = R0,0273 per g; R17/660 g = R0,0258 per g; R28/1000 g = R0,0280 per g.
  2. Step 2: The smallest value is for the 660 g size.
Answer
660 g for R17.
Why not the others: 330 g for R9: this size is not the cheapest per gram. 1000 g for R28: this size is not the cheapest per gram. All three cost the same per gram: the prices per gram are different.

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