*Solution* Let x = mass of rabbit Let y= mass of cat Let z= mass of dog x + y = 10 ( i ) x + z = 20 (ii) y + z = 24 (iii) From ( i ) x = 10 - y Substituting x in( ii ) ( 10 - y) + z = 20 10 - y + z = 20 -y + z = 20 - 10 -y + z = 10 ( iv ) Adding ( iii) and ( iv ) y + z = 24 -y + z = 10 2z = 34 z = 17 Substituting x in ( ii) x + 17 = 20 x = 20 - 17 x = 3 Substituting x in ( i ) x + y = 10 3 + y = 10 y = 10 - 3 y = 7 Therefore x + y + z = 17 + 3 + 7 = 27 Correct Answer (B) 27 kg ❤️