Posted by rob on .
Tina Mixes pretzels that sell for $2 a lb with cereal that sells for $3 a lb. she wants to make an 8 lb mixture to sell for $2.50. write 2 equations to represent this info.
How many lbs of pretzels and how many lbs of cereal were used to make the 8 lb mixture?

algebra 
Reiny,
pretzels  p
cereal  c
p+c = 8
2p + 3c = 2.5(8)
rewrite the first : c = 20  p
sub into 2nd
2p + 3(20p) = 20
easy to solve