mr. anderson bought some books for 3 dollars each and a few pens for 4 dollara each. his total cost was 60 dollars. he ended up with double the number of books than pens when he finished shopping. how many of each did he end up with​

Step-by-step explanation:

b and p are the number of books and pens, respectively.

“books for 3 dollars each and pens for 4 dollars each. total cost was 60 dollars“

3b + 4p = 60

“he ended up with double the number of books than pens”

b = 2p

3(2p) + 4p = 60

10p = 60

p = 6

b = 2p = 12

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