Question 1139185
<pre>
Put letters for the unknown numbers of children and adults below,
and put the given numbers for the others:

{{{system(matrix(3,7,

(matrix(4,1,UNKNOWN,NUMBER,OF,CHILDREN)),
""+"",
(matrix(4,1,UNKNOWN,NUMBER,OF,ADULTS)),
"",
""="",
"",
(matrix(3,1,NUMBER,OF,PEOPLE)),

"","","","","","","",


(matrix(3,1,PRICE,PER,CHILD))(matrix(4,1,UNKNOWN,NUMBER,OF,CHILDREN)),
""+"",
(matrix(3,1,PRICE,PER,ADULT))(matrix(4,1,UNKNOWN,NUMBER,OF,ADULTS)),
"",
""="",
"",
(matrix(3,1,TOTAL,MONEY,COLLECTED)))   )}}}

Then solve the system of equations for the two unknowns.

Edwin</pre>