thats a lot of money LOL, anyways..
Answer:
26 adults and 55 children
Explanation:
we can create two equations
1. A + C = 81 (since there were 81 people in total on the school trip).
2. 7A + 4C = 402 (since the total bill was $402, with $7 for each adult and $4 for each child).
use the first equation to express one of the variables in terms of the other, and then substitute it into the second equation.
express A in terms of C:
A = 81 - C
substitute this expression for A into the second equation:
7(81 - C) + 4C = 402
expand to solve for C:
567 - 7C + 4C = 402
combine like terms:
-3C = 402 - 567
-3C = -165
divide by -3 to solve for C:
C = -165 / -3
C = 55
55 children on the school trip. now, you can use the first equation to find the number of adults:
A + 55 = 81
subtract 55 from both sides:
A = 81 - 55
A = 26
so, there were 26 adults on the school trip.
there were 26 adults and 55 children who went to the jurassic zoo on the school trip.