Question 508801
<pre>
There are two equation, (1) a PEOPLE equation and (2) a MONEY equation.
You have the MONEY equation correct:

 4a + 1.5c = 5050

But you are forgetting the PEOPLE equation which comes from:

{{{(matrix(3,1,

NUMBER,
OF,
ADULTS))+(matrix(3,1,
NUMBER,
OF,
CHILDREN))=(matrix(3,1,
NUMBER,
OF,
PEOPLE))}}} 

or

a + c = 2200

So you have this system of equations:

 a +    c = 2200
4a + 1.5c = 5050

Solve that either by substitution or elimination and
you will get a = 700, c = 1500

Edwin</pre>