Paul's Class II

In Paul's class there are 25 students, 1/5 of chose Spanish as the favourite subject. The half of the rest prefer the Maths. The 60% of the students that doesn't prefer Spanish or Maths, chose Biology as their favourite subject. Knowing that the 75% of the rest of the students prefer Chemistry, how many students haven't chose Spanish, Maths, Biology or Chemitry as favourite subject

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