Respuesta :

School bus : 9 tons = 9*2000 = 18,000 pounds
Horse : 1,100 pounds
Elephant : 5,500 kilograms = 5,500*2.2 = 12,100 pounds
Grand piano : 15,840 ounces = 15,840/16 = 990 pounds

So the answer is
RELAXING NOICE
Relax