 
 <translate> Use some thinking to answer the following question. Which of the following CANNOT be weighed using a balance scale and these unit weights: 2, 4, 7, and 10
Options:
(A) 16
(B) 15
(C) 18
(D) 19
(E) 21 <hau> Ka yi tunani a kan wannan tambayar. Wanne daga cikin wadannan ba za a iya auna su ta amfani da sikelin ma'auni da waɗannan nauyin naúrar ba: 2, 4, 7, da 10 Zaɓuɓɓuka: (A) Goma sha shida (B) Goma sha biyar (C) 18 (D) 19 (E) 21 