 
<translate> Matsakaicin lambobi 20 = 0 Jimlar lambobi 20 = (0 * 20) = 0 Yana yiwuwa cewa 19 daga cikin waɗannan lambobi na iya zama tabbatacce kuma idan jimlar su a, to lambar 20 ita ce (-a). Amsar ƙarshe: (D). <eng> 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). 