Question

Write an expression for: the total cost of 6 pens and 3 folders. A folder costs $1.15 more than a pen

Answer 1

A folder costs 1.15 more than a pen, so a pen is x, folder is x+1.15

COST = 6x + 3(x + 1.15)

An equation for this problem is
Cost = number of pens(x) + number of folders (x + 1.15)

Answer 2

9x + 3.35

Explanation:

Let the cost of one pen is $x.

Hence, the cost of a folder is 1.15 +x

Therefore, cost of 6 pens = 6x

And cost of 3 folders

= 3 (1.15+x)

= 3.35 + 3x

Therefore, cost of 6 pens and 3 folders is given by

=6x + 3.35 +3x

= 9x + 3.35

Therefore, the required expression is 9x + 3.35