Add Masses without Inventing a Volume Rule - Practice 1

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In a closed paper model with no material loss, combined mass is the sum of component masses. Do not assume volumes must add in exactly the same way; different mixtures can change volume on mixing.

Worked example

Combine 20 g of one material with 30 g of another without loss. The combined mass is 50 g; no volume conclusion was supplied.

Level-balance schematic compares 20 g + 30 g with Combined: 50 g. Condition: No material loss. The level beam represents equal total mass; shapes are not drawn to scale.

Question 1 Paper mixture 1: 20 g and 30 g are combined with no loss. Excluding the container, what is the combined mass in g? Answer

Question 2 Paper mixture 2: 23 g and 32 g are combined with no loss. Excluding the container, what is the combined mass in g? Answer

Question 3 Paper mixture 3: 26 g and 34 g are combined with no loss. Excluding the container, what is the combined mass in g? Answer

Question 4 Paper mixture 4: 29 g and 36 g are combined with no loss. Excluding the container, what is the combined mass in g? Answer

Question 5 Paper mixture 5: 32 g and 38 g are combined with no loss. Excluding the container, what is the combined mass in g? Answer