 
<translate> Obi ụtọ na-enwe 40 / 100 * 15 = 6 iko mmiri karịa ka ọ na-ewe ugbu a iji ruo mmiri nke dọkịta ya tụrụ aro ya. Ná ngụkọta, ọ ga-aṅụ iko mmiri 6 + 15 = 21 kwa izu. Azịza ikpeazụ: 21. <eng> Happy has to take 40 / 100 * 15 = 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 = 21 cups of water every week. Final answer: 21. 