Question

Jovanny is enrolled in a college program where he needs at least 120 credits to graduate. He already has 70 credits completed, what is the fewest number of three credit classes he will need?

Answer 1

Let x be the number of three credit classes. The total credits for this classes will be:

`3x`

Now, we know he already has 70 credits, that means that the total is:

`3x+70`

Now this has to be al least 120, that means that we have the inequality:

`3x+70\ge120`

Solving for x we have:

`\begin{gathered} 3x+70\ge120 \\ 3x\ge120-70 \\ 3x\ge50 \\ x\ge(50)/(3) \\ x\ge16.67 \end{gathered}`

Now, since Jovanny can't take a fraction of a class he need to take 17 three credit classes.