Question 667726
Establish variables
x = adults
y = children
...
15x + 10y = 1600
x = 2y
...
Substitute x into the first equation
15(2y) + 10y = 1600
30y + 10y = 1600
40y = 1600
...
Divide both sides by 40
{{{highlight_green(y = 40)}}} children's tickets
...
x = 2(40) = {{{highlight_green(x=80)}}} adult's tickets
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