Question 465279
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Hi,
Let x and (400-x) represent the number of adult and youth tickets respectively
Question states***
 $12x + $6(400-x)= $4020
    6x = 1620 
     x = 270,number of adult tickets. 130 the number of child fares (400-270)

CHECKING our Answer***
 $12*270 + $6*130 = $4020