Answer: Jon purchased 4 staplers and 7 three hole punchers.
Step-by-step explanation:
Let x be the number of staplers and y be the number of three hole punches purchased by Jon.
Then the equation for total items will be
[tex]x+y=11[/tex]............(1)
And the equation for the total cost will be
[tex]7x+12y=112[/tex]........................(2)
Multiply eq(1) by 7 and then subtract from eq (2), we get
[tex]7x+12y-(7x+7y)=112-7(11)\\\Rightarrow5y=112-77\\\Rightarrow\ 5=35\\\Rightarrow\ y=7[/tex]
Put y=7 in eq(1), we get x= 4.
Hence, Jon purchased 4 staplers and 7 three hole punchers.
