Question

Please help me on this problem

Answer 1

see below

Explanation:

reserve = x

field =y

box = z

x * 20 +y*50 +z*100 =370

x=2y

x + y+ z =10 so 3y +z=10 so z=10-3y

2y * 20 + y*50 + (10-3y)*100 =370

90*y+1000-300*y =370

210*y=630

y tickets =3

x tickets=6

z tickets =1