Liam and 2 of his friends have backpacks. The backpacks have masses of 6 kilograms,4 kilograms, and 5 kilograms. What is the total mass of three backpacks

Respuesta :

6+4+5= 15 
The three backpacks will weigh 15 kilograms all together because you just have to add up all of the masses

Add all the masses together , and you'll get 15 .