candle shop

Question

a candle shop sells scented candles for $16 each and unscented for $10 each. today the shop sold 28 candles and makes $400. how many scented candles did they sell? how many unscented candles?

Answer 1

16S+10U=400

 

S+U = 28

S=28-U

 

16(28-U)+10U=400

448-16U+10U=400

448-6U=400

-6U=-48

6U=48

U=8

 

S+U = 28

S+8=28

S=20