The jurassic zoo charges $5 for each adult and $3 for each child the total bill for the people from school trip was $420 how many adults and how many child went to the zoo

The number of adults who went to the zoo was 21 and the number of children was 105.

Step-by-step explanation:

The complete question is

The Jurassic Zoo charges $5 for each adult admission and $3 for each child. The total bill for the 126 people from a school trip was $420. How many adults and how many children went to the zoo?

Let

x -----> number of adults

y ----> number of children

we know that

------> equation A

----> equation B

Solve the system by graphing

The solution is the intersection point both graphs

The solution is the point (21,105)

see the attached figure

therefore

The number of adults who went to the zoo was 21 and the number of children was 105.

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.