How many students are offering both biology and chemistry,if only 70 students are offering neither biology or chemistry.
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Out of 400 students in a final year of a senior secondary, 300 are offering Biology and 190 are offering Chemistry.
How many students are offering both Biology and Chemistry if 70 students are offering neither Biology nor Chemistry.
Let the number of students offering both Biology and Chemistry.
Biology student only
Chemistry student only
Neither Biology nor Chemistry