When you evaluate the problem you end up with 204100
Scientific Notation: 2.041 x 10^5
For this case we propose a system of equations:
x: Let the variable representing the number of children in the concert
y: Let the variable representing the number of adults at the concert
According to the assistance we have:

According to the cost we have:

Substituting the first in the second equation we have:

Thus, the concert was 375 adults.
On the other hand we have:

Thus, the concert was 1125 children.
In total they were:
people
ANswer:
The concert was 1500 people
Answer:
infinite solutions
Step-by-step explanation:
I don't really get your question. But, I will try my best to answer it. 42 is a whole number and you could use the number for any operation.
I hope this helps:)