Answer:
This phrasing is unusual, but let's attempt to tackle it:
M stands for Molly's weight
A represents Arthur's weight
G signifies Ginny's weight.
We can express the total weight as:
(M + A) + G
or alternatively as:
A + (G + M)
the first configuration illustrates Molly and Arthur's weights combined (hence their weight is presented as a single value), followed by Ginny's weight calculated separately.
The second configuration indicates Arthur's weight on its own, while Ginny and Molly's weights are combined (which is why their total weight appears as a single value)
