Final answer:
The total mass in one of the pans of the beam balance is 3.99 kg.
Step-by-step explanation:
In one of the pans of the beam balance, the masses are 3 kg, 900 g, and 90 g. To find the total mass, we need to add up all the masses. Converting 900 g to kg, we get 0.9 kg, and converting 90 g to kg, we get 0.09 kg. Adding all the masses together, we get a total mass of 3.99 kg. he question involves calculating the total mass of objects on one of the pans of a beam balance. To do this, convert all the masses into the same unit (kilograms) before adding them together. The masses given are 3 kg, 900 g, and 90 g. Since 1 kg = 1,000 g, we can convert 900 g to 0.9 kg and 90 g to 0.09 kg. Now we sum these values:
3 kg + 0.9 kg + 0.09 kg = 3.99 kg
Therefore, the correct statement that represents the total mass is: a) Total mass = 3.99 kg.