A pipe can pump 1000 gallons of water in 4 hours.

How long would it take the pipe to fill a 2500 gallon pool?

A.
4 h

B.
8 h

C.
10 h

D.
25 h

Question

A pipe can pump 1000 gallons of water in 4 hours. 

How long would it take the pipe to fill a 2500 gallon pool?
 
 A.
4 h
 
 B.
8 h
 
 C.
10 h
 
 D.
25 h

mathmale · Answer

One way to do this problem involves using an equation of ratios.

1000 gallons of water in four hours, and 2500 gallons in x hours.

One way to write this equation would be$$\frac{ 1000 }{ 2500 }=\frac{ 4 }{ x }$$

mathmale · Answer

Cross multiply.  then solve for x (hours).

anonymous · Answer

Do you know how to do this?

anonymous · Answer

no

anonymous · Answer

Cross multiplying gives us:

1000x=10,000

mathmale · Answer

OrangeMaster:  I'd be interested in seeing how you'd explain "cross multiplication."

mathmale · Answer

WHAT YOU'RE doing is, of course, fine!

anonymous · Answer

$$1000x \div 1000=x$$$$10,000\div1000=?$$

mathmale · Answer

Sweetie:  OrangeMaster hs come up with the equation 1000x=10000, and is asking you to solve it for x.

anonymous · Answer

@sweety2415, can you figure it out?

anonymous · Answer

no sorry

anonymous · Answer

Do you have a calculator?

anonymous · Answer

no

anonymous · Answer

Take it this way. 1x=10 What would you multiply 1 by to get 10?

anonymous · Answer

Pump is 1000 gal/4 hours = 250 gal/hr

Pool is 2500 gal

Time needed is (2500 gal)/(250 gal / hr) = answer in hours

anonymous · Answer

it's to hard :(

anonymous · Answer

How many 1000's are in 10,000?

anonymous · Answer

You can even use fingers in necessary.

anonymous · Answer

Do you have Google?