 
 <translate> Average of 20 numbers = 0
Sum of 20 numbers = (0 * 20) = 0
It is quite possible that 19 of these numbers may be positive and if their sum is a, then 20th number is (-a). The final answer: (D). <ibo> Nkezi nke nọmba 20 = 0 Nchịkọta nke nọmba 20 = (0 * 20) = 0 Ọ ga-ekwe omume na 19 n'ime ọnụọgụ ndị a nwere ike ịdị mma ma ọ bụrụ na nchikota ha bụ a, mgbe ahụ ọnụọgụ nke iri abụọ bụ (-a). Azịza ya bụ: (D). 