Sven is trying to find the maximum amount of time he can spend practicing the five scales of piano music he is supposed to be working on. He has 40 minutes to practice piano and would like to spend at least 15 minutes playing songs instead of practicing scales. So, Sven sets up the following inequality, where t is the number of minutes he spends on each scale and solves it. 40 − 5t ≤ 15 −5t ≤ −25 t ≥ 5 Sven has concluded that he should spend 5 minutes or more on each scale. Is this correct? If not, what mistake did he make? Then solve for the correct answer.