According to the given information, X + Y + Z = 268 X sells 12 phones less than Z X = Z – 12 Y sells half the number of phones sold by Z Y=Z∕2 Substituting ‘X’ and ‘Y’ in ‘X + Y + Z = 268’ Z−12+Z∕2+Z=268 2Z−24+Z+2Z∕2=268 5Z – 24 = 536 5Z = 560 Z = 112 Salesman ‘Z’ sold 112 phones. Hence, “112” is the correct answer.