Answer:
57 children
54 adults
Step-by-step explanation:
Let's call x the number of children admitted and call z the number of adults admitted.
Then we know that:

We also know that:

We want to find the value of x and z. Then we solve the system of equations:
-Multiplay the first equation by -4 and add it to the second equation:


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Now we substitute the value of x in the first equation and solve for the variable z



10 is the answer
explanation. Find the volume and multiply that by 2
the doubled volume is 10
So firstly, multiply both sides by t: 
Next, add both sides by v0, and your answer will be: 