2025 SST PRELIMS P1 Q10

2025 SST PRELIMS P1 Q10

Secondary 4
3 marks

A bag contains blue, green and red marbles. The probability of choosing a green marble is 0.2 and the probability of choosing a red marble is 0.35.

  1. Find the probability of choosing a blue marble at random.[1]
  2. There are 9 more red marbles than green marbles. Find the total number of marbles in the bag.[2]

Solution:

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Answer:(a) \(0.45\) (b) \(60\)

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