Question

Working together, two pumps can drain a certain pool in 4 hours. If it takes the older pump 9 hours to drain the pool by itself, how long will it take the newer pump to drain the pool on its own?

Answer 1

Do you know the answer?

Answer 2

?

Answer 3

let two pump one and two
pump one in 9 hour empty 1 tank
in 1hour it will empty = 1/9 tank
let pump 2 empty in x hour
similary pump two will empty 1/x tank
together in one hour
=1/9 +1/x=(x+9)/9x
full tank together they empty in 4 hour
(x+9)/9x tank empty in = 1 hour
1tank will= 1/((x+9)/9x)=9x/(9+x)=4hour
9x=4*(9+x)
9x=36+4x
5x=36x=36/h hour

Answer 4

sorry 36/5

Answer 5

A box of crayons costs $1.75, including tax. Mr. Valentino wants to purchase boxes of crayons for his class and has a $25 budget. Write an inequality to solve for the number of boxes of crayon Mr. Valentino can purchase with his budget.