Given:
Cecile uses
of her supply of sunflower seeds to make a salted snack mix and
of her supply to make an unsalted snack mix.
Cecile uses 10 pounds of sunflower seeds.
To find:
The total pounds of seeds in her supply.
Solution:
Let x be the total pounds of seeds in her supply.
Cecile uses
of her supply of sunflower seeds to make a salted snack mix, i.e.,
.
Cecile uses
of her supply to make an unsalted snack mix, i.e.,
.
Total sunflower seeds used = 10 pounds.




Divide both sides by 5.

So, there are 18 pounds of seeds in her supply.
Therefore, the correct option is A.