Question

It cost $5 for an adult and $2 for a student to visit the National Botanical Gardens. Adults can be members of the Botanical Society and if you are a member, you can visit the gardens for free. A group of 30 adults and students visits the gardens. Five members of the group could go in for free and it cost the rest of the group $104 to go in. How many students were in the group?

Answer 1

5 free 

x = adults
y = stud

    x+y = 25
5x+2y = 104

eliminasi y:
2x+2y =   50
5x+2y = 104 (-)
     -3x = -54
        x = 18

subtitusi x = 18:
x+y = 25
    y = 25-18
    y = 7

student = 7

Answer 2

I think this question there is a problem. If the cost is $5 for adult and $2 for students. Then 5 adults who are member so ther's 25 adults. then 25 times 5 is equel to 125. So, its around $125 that they should pay. But they only pay $104. Thanks