Question
25 of the pens in a bag were yellow and the rest were green and grey. 25% of the green pens and 40% of the grey pens were thrown away. There was an equal number of green and grey pens left. If there were 468 green and grey pens left,
  1. What was the number of yellow pens?
  2. What was the total number of pens in the bag at first?
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(a)

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(b)

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25 of the pens in a bag were yellow and the rest were green and grey. 25% of the green pens and 40% of the grey pens were thrown away. There was an equal number of green and grey pens left. If there were 468 green and grey pens left,
  1. What was the number of yellow pens?
  2. What was the total number of pens in the bag at first?