Question 1034089
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A=adults; C=children
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A+C=126
A=126-C . Use this to substitute for A below
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3A+2.25C=343.5 . Substitute for A (from above)
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3(126-C)+2.25C=343.5
378-3C+2.25C=343.5
-0.75C=-34.5
C=46
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46 Children attended
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A=126-C=126-46=80
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80 Adults attended
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CHECK:
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3A+2.25C=343.5
3(80)+46(2.25)=343.5
240+103.5=343.5
343.5=343.5