Question

Tickets to a football match cost $8,$15 or $20 each. The number of $15 tickets sold was double the number of $8 tickets sold. 6000 more $20 tickets were sold than $15 tickets. If the gate receipts totalled $783 000, how many of each type of ticket were sold?
f = 15 , e = 8 , t = twenty

f = 2 e ... e = f/2

t = f + 6000

8 e + 15 f + 20 t = 783000

substituting ... 4 f + 15 f + 20 f + 120000 = 783000

solve for f , then substitute back to find e and t

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