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Question

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Keith had 694 green, yellow and blue marbles. He had 3 times as much as yellow marbles. There were 90 fewer green marbles than blue marbles. How many blue marbles did Keith have?

Answer

This is a Part Whole question. 

Start with the Ratio.

   Yellow Green   blue  Total
  1u 3u – 90 3u  7u – 90
         

7u – 90 = 694

7u = 694 + 90 = 784

1u =784 ÷ 7 = 112

3u = 112 × 3 = 226 blue

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