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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The answer is 1.
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1 solution
1/5 of 25 is 5 so remaining are 20
1/2 of 20 is 10 so remaining are 10
60% of 10 is 6 so the remaining are 4
75% of 4 is 3 so the remaining is 1