Question

Chale bought some packages of pens. He bought one package containing 5 pens and *n* packages containing two pens each. Which of the following expressions could be used to find the total number of pens that Chale bought?

A)7n
B)10n
C)5n+2
D)2n+5

Answer 1

5*1 = 5     [He bought one package containing 5 pens]
n*2 = 2n   [and n packages containing two pens each]

So the total number of pens that he bought is  2n+5

Answer 2

d) 2n+5 
This is because you know how many packages of 5 pens he bought which is 1. So that stays the same. you are trying to figure out how many packages of 2 pens he bought so that is a variable. so to find the total number of pens it is 2n+5.