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

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) (Show Source): You can put this solution on YOUR website!
.
Chemistry: x - 250

Biology:

Physics: 72.

Equation:

(x-250) + + 72 = x.

Solve it:

= 250 - 72 = 178.

x = 178*2 = 356.

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

Answer. 356 students.

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