Teo makes a necklace of x wooden beads at $0.50 each and 6 glass beads at $1.25 each. The average cost of the beads in the necklace is $0.75. What is x?
(50x + 125(6) )/ (6+x) = 75
50 x + 750 = 450 + 75x
300 = 25x
x = 12
+37159 
