To increase her water intake to the recommended level by her doctor, Happy has to take 40% more cups of water than she takes now. If she is currently drinking 15 cups of water every week, what's the recommended number of cups per week?
Happy has to take 40/100 * 15 = <<40/100*15=6>>6 more cups of water than she takes currently to reach the recommended water intake levels by her doctor.
In total, she is supposed to drink 6+15 = <<6+15=21>>21 cups of water every week.
#### 21