Question 1073163
Let s be a senior citizen ticket, and c be a child ticket. Then:
1s+13c=204 and
9s+3c=126
So:
9s+117c=1836
9s+3c=126
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114c=1710
c=15
s=9
Senior tickets are $9 each, and children's tickets are $15 each. ☺☺☺☺