 
<translate> Tụgharịa ajụjụ, zaa ụzọ abụọ site na nkọwa a: Ọ rere ihe dịka akwụkwọ iri na isii kwa ọnwa n'ime ọnwa atọ ahụ niile ya mere ọ ga-abụrịrị na ọ rere ngụkọta nke akwụkwọ 3 * 16 = 48 n'ime ọnwa atọ ahụ. Ọ rere 15 + 16 = 31 na Jenụwarị na Febụwarị. Ọ ga-abụrịrị na o rere akwụkwọ iri anọ na asatọ - iri atọ na otu = iri na asaa n'ọnwa Mach. <eng> Reconstruct a question, answer pair from this explanation: He sold an average of 16 books per month across all 3 months so he must have sold a total of 3 * 16 = 48 books in those 3 months. He sold 15 + 16 = 31 in January and February. He must have sold 48 - 31 = 17 books in March.
 