Question

Shaneen has $30 to spend on CDs that each cost $10. She wants to calculate n, the number of CDs she can buy with her $30. Which inequality represents the maximum number of CDs she can buy?

Answer 1

`10n \le 30`

`n \le 3`

Explanation:

Given

`Total = \$30`

`Cost (each) = \$10`

Required

Determine the inequality

Assume she wants to buy n CDs.

If 1 CD costs $10, then n CDs costs 10n.

So, the inequality is:

`10n \le 30`

We used
`\le` because the amount she wants to spend cannot exceed 30

Divide both sides by 10, to solve for n

`n \le 3`