Answer:
We have the following system of equations:

(2) = x = 350-y . Replace x in equation (1 )
=> 5(350-y)+10y=2000 => y = 241
Replace y=241 in equation (2 ) => x = 350-241 = 109
the number of both children and adult tickets the theater can sell.
Children tickets : 109
Adult tickets : 241
Explanation: