Question 990062
.
Chemistry: x - 250


Biology: {{{x/2}}}


Physics: 72.


Equation:


(x-250) + {{{x/2}}} + 72 = x.

 
Solve it:


{{{x/2}}} = 250 - 72 = 178.


x = 178*2 = 356. 


<U>Check</U>: (356-250) + {{{356/2}}} + 72 = 106 + 178 + 72 = 356.


<B>Answer</B>. 356 students.