The cost of one pencil and one pen is required.
The cost of a pencil is $0.35 and a pen is $0.75.
The number of pens is 12.
The number of pencils is 20.
Let the cost of one pencil be [tex]x[/tex]
A pen costs $0.40 dollar more than pen.
So, cost of a pen is [tex]0.4+x[/tex]
Total cost of all the pens and pencils is $16.
So,
[tex]12(0.4+x)+20x=16\\\Rightarrow 4.8+12x+20x=16\\\Rightarrow x=\dfrac{16-4.8}{12+20}\\\Rightarrow x=0.35[/tex]
Cost of pencil is $0.35 and cost of pen is [tex]0.4+0.35=\$0.75[/tex].
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