Question 1138684
<br>
a = cost per adult
c = cost per child<br>
Then the given information is<br>
{{{3a+2c = 21}}}
{{{2a+c = 13}}}<br>
Solve by any method you choose.<br>
Here is one unusual method that works nicely on this problem.<br>
3 adults and 2 children cost $21; 2 adults and 1 child cost $13; the difference is 1 adult and 1 child for $8.<br>
Now compare that to 2 adults and 1 child for $13; the difference is 1 adult for $5.<br>
So the cost for each adult is $5; that makes the cost for each child $3.