Question

Peter babysits his sister on Monday and Friday. He babysits for his neighbor 40% of the days Monday through Friday. He babysits for his sister and his neighbor on different days. On the weekend, Peter babysits 50% of the days. How many days does Peter babysit each week?

Answer 1

5

Explanation: Neighbor days = 40% of Mon–Fri = 0.4×5 = 2 days (and they can't be Mon or Fri because those are sister days). Weekend days = 50% of Sat–Sun = 0.5×2 = 1 day. Total = 2 (sister) + 2 (neighbor) + 1 (weekend) = 5 days.