<prompt> Katika mraba wa kichawi ulioonyeshwa, hesabu za nambari katika kila safu, safu wima na diagonal ni sawa. Nambari tano kati ya hizi zinawakilishwa na v, w, x, y, na z. Tafuta y z.asy unitsize10mm; defaultpenlinewidth1pt; kwaint i0; i3; i teka0,i--3,i; chorai,0--i,3; lebo25,0.5,0.5; leboz,1.5,0.5; lebo21,2.5,0.5; lebo18,0.5,1.5; lebox,1.5,1.5; leboy,2.5,1.5; lebov,0.5,2.5; lebo24,1.5,2.5; lebow,2.5,2.5;asy  <response>: Mifano ya hesabu ni v 18 25 v 24 w v x 21. Kisha18 25 24 w,hivyo w 19. Pia,18 25 x 21,hivyo x 22.Jumla ya mara kwa mara ni 25 22 19 66, hivyo y 66 - 19 - 21 26 na z 66 - 25 - 21 20, hivyo y z 46. 