Your friend bought 3 bags of wild bird seed and an $18 bird feeder. each bag of birdseed costs the same amount. if your friend spent $45, find the cost of one bag of birdseed.

3 bags and an 18 dollar bird feeder
cost=cost of bird seed+cost of bird feeder
cost=cost of bird seed+18
cost=45
45=cost of bird seed+18
subtract 18 from both sides
27=cost of bird seed

the bird seed came in 3 bags and each bag cost the same so
27=3 times cost of 1 bag of bird seed
divide by 3
9=cost of 1 bag of bird seed

answer is $9.00

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