In a school there are 100 students and every student studied at least one subject. 60 candidates studied physics and 80 candidates studied biology. what is the number of candidates studying both physics and biology.
40
60
80
100
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0
Answer:
40
because there are 100 students in that 60students already finished with study of physics
80students have already finished the study of biology so,
100-60=40
( 80-60=20
100-80=20) these 20+20= 40
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