When two pipes fill a pool together, they can finish in 4 hours. if one of the pipes fills half the pool then the other takes over and finishes filling the pool, it will take them 9 hours. how long will it take each pipe to fill the pool if it were working alone?

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

An appliance store sells lamps at $95.00 for two. a department store sells similar lamps at 5 for $250.00. which store sells at a better rate

Can someone me out here number 4 plz