1. x = adult tix revenue from adult tix = $ 7.5x
(115-x) = kidz tix revenue from kidx = $3.00(115-x)
the revenues from BOTH tix added together = $ 678
7.5x + 3 (115-x) = 678
4.5x = 678-345
4.5x =333
x= adult tix = 74
2. Pure silver amount = x x(31.48) = cost of pure silver
Alloy = 50 oz 50(22.35) = cost of alloyT
The two costs added together = (x+50)(25.98)
31.48 x + 50(22.35) = (x+50)(25.98)
31,48 x + 1117 .5 = 25.98x + 1299
5.5x = 181.5
x= amount of pure silver = 33 ounces
3....similar to 2....let me know if you need more help....