One cast iron has a mass of 24.9 kg, the other is 9.75 kg heavier than the first and the third is 1.9 kg

One cast iron has a mass of 24.9 kg, the other is 9.75 kg heavier than the first and the third is 1.9 kg lighter than the second, which is the mass of all three castings.

To begin with, let’s find the mass of the second iron casting, for this we take the mass of the first iron casting and add 9.75 kg to it, since in the condition of this problem we are told that it is 9.75 km heavier than the first one:

24.9 + 9.75 = 34.65 kg weight of the second casting.

Now we take and subtract 1.9 kg from the weight of the second casting, since the third casting is lighter than the second one by 1.9 kg:

34.65 – 1.9 = 32.75 kg weight of the third casting.

Now we are looking for the sum of all castings:

24.9 + 34.65 + 32.75 = 92.3 kg total weight (mass) of all cast iron castings.

Answer: 92.3 kilograms.