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Mungkin seharusnya "Pada pertunjukkan seni dan budaya telah terjual 278 tiket dengan total penerimaan Rp13.000.000,00"misal :
dewasa = x
pelajar = y
anak = z
x + y + z = 278 ...(1)
x = 2y - 10 ...(2)
60.000x + 35.000y + 25.000z = 13.000.000
sederhanakan
12x + 7y + 5z = 2.600 ...(3)
substitusi (2) ke (1)
x + y + z = 278
2y - 10 + y + z = 278
3y + z = 278 + 10
3y + z = 288
substitusi (2) ke (3)
12x + 7y + 5z = 2.600
12(2y - 10) + 7y + 5z = 2.600
24y - 120 + 7y + 5z = 2.600
31y + 5z = 2.720
eliminasi
31y + 5z = 2.720 (x1)
3y + z = 288 (x5)
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31y + 5z = 2.720
15y + 5z = 1.440
--------------------------- -
16y = 1.280
y = 1.280 / 16
y = 80
3y + z = 288
3(80) + z = 288
240 + z = 288
z = 288 - 240
z = 48
x + y + z = 278
x + 80 + 48 = 278
x + 128 = 278
x = 150
jadi jumlah masing-masing tiket
dewasa = 150 tiket
pelajar = 80 tiket
anak = 48 tiket