Question

number 3 please show work☺☺

Answer 1

60/20= 3, 3 x 4 gal every 20 hrs = 12 gallons in 60 hrs.

Answer 2

I would make a ratio to how fast water is leaking:

$\frac{4}{20} = \frac{1}{5}$  

So we can conclude that one gallon is leaking every 5 hours.

So if we multiply that ratio by any number of hours, it will tell us how many gallons have leaked.  In this case, it's 60 hours, so we can do:

$\frac{1}{5}*60 = 12$

So we can conclude that in 60 hours, 12 gallons of water leak.

We also could have done this problem by realizing that 20 hours is $\frac{1}{3}$ of 60 hours, so to get how many gallons of water leak in 60 hours, you just multiply the amount of water that leaks in 20 hours by 3:

$4*3=12$

Two ways to do the same problem; same answer.