SOLUTION: In 1980 every student at South High School to exactly 1 of 3 science courses chemistry biology or physics at all but 250 students to chemistry exactly one-half of all the students

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Question 990062: In 1980 every student at South High School to exactly 1 of 3 science courses chemistry biology or physics at all but 250 students to chemistry exactly one-half of all the students took biology and exactly 72 physics how many students attended South High School. Year
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
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Chemistry: x - 250

Biology: x%2F2

Physics: 72.

Equation:

(x-250) + x%2F2 + 72 = x.

Solve it:

x%2F2 = 250 - 72 = 178.

x = 178*2 = 356.

Check: (356-250) + 356%2F2 + 72 = 106 + 178 + 72 = 356.

Answer. 356 students.