Cost of each pound choice birdseed = $1.51
Cost of each pound garden birdseed = $0.91
• Let "x" be the amount (in lb) of choice birdseed, and
,
• Let "y" be the amount (in lb) of garden birdseed
Becky purchases 20 pounds of birdseed, so we can write:

Total amount spent on birdseeds is $26. Thus, we can write:

We can solve for "x" in the first equation, substitute into the second equation and solve for "y". All the steps are shown below:

We can use this value and substitute into the first equation and figure out the value of "x". Shown below:

Answer
Pounds of Choice Birdseeds = 13
Pounds of Garden Birdseeds = 7