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Add all the measurements together than divide by the total number of measurements you added. For example, to average 5kg, 7kg, and 9kg, we add 5, 7 and 9 then divide by 3 (because you are adding three numbers together) to find the average of 7.
If these are measurements (such as a room, a portrait, a rug), the height and width in inches (or feet, since you don't specify that) would differ on each one.
The ratio of the areas is 35:80 or 7:16
If the shape is a cuboid then 7*5*2 = 70 cubic cm
Add all of the measurements together and then divide that sum by the number of measurements to get the mean. Example: (2,2,3,5,7,9). 2+2+3+5+7+9= 28. Then 28 divided by 6 (the number of terms) = 4.666 or 4 2/3