Line RS line RT and line ST
C. 125
Since a triangle equals 180 degrees you will have to subtract 180-35-20= 125.
D/2 + c/3
10/2 + 6/3
5+6/3
=5+2
=7
The meals for all 9 cost 9x5 = $45
225-45= $180 which represent the entrance fees for all 9.
We divide that to 9 and we get the entrance fee per student!
180/9 = $20 / fee per student!
