As title states, I need to brush up on my algebra... been a few years.

This is the question:

the number of half-pound packages of tea that can be made up from a box that holds 10 1/4 pounds of tea is.

This is the formula and answer:

Code:

10¼ lbs ÷ ½ = 41/4 x 2/1 = 20½

What I need to know, in order for my brain to dig up those lessons in the recesses of my brain, is how this is determined. Where does 20½ come from 41/4 x 2/1? I see division, but multiplying that number I just can't grasp.

I also seen a few videos on youtube regarding algebra, maybe someone knows a specific example they could direct me to.

Thanks