Question
Find the missing digits. 
1 X Y + Z Y 5 = 5 Y 7
(a) X
(b) Y
(c) Z
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

(c)

Click button first when a symbol is required. X

Find the missing digits. 
1 X Y + Z Y 5 = 5 Y 7
(a) X
(b) Y
(c) Z