What percentage of muscle weight would you have if 60 pounds out of 140 pounds is muscle weight?
What is the muscle weight of a 200 pound male?
What is the muscle weight of a 90 pound female?
If muscle weight is 90 pounds, how much does the person weigh?
If muscle weight is 45 pounds, how much does the person weigh?

All the answers are based on the percentage calculated in the first question, in which you only need to make a simple rule of three, as I show you below:

140 pounds (total weight) = 100
60 pounds (muscle weight) = X

In the previous formula we mentioned that 140 pounds is the total weight, so it corresponds to 100% of the weight of an individual, while on the other hand, we have 60 pounds which is the muscle weight of which we want to find the percentage, whose unknown we have called X, with this data it is operated as follows:

X = (60 * 100) / 140 = 42.86% approximate.

As you already know in theory the muscular percentage of weight (42.86%), when they give you the total weight and ask you for the muscular weight, you must multiply the percentage by the total weight, as is necessary for questions 2 and 3:

200 * 42.86% = 85.72 pounds.
90 * 42.86% = 38.57 pounds approximate.

In the cases in which they give you the muscular weight and ask you for the total weight, you no longer multiply the percentage but divide to obtain the total weight, as happens in questions 4 and 5:

90 / 42.86% = approximately 209.99 pounds.
45 / 42.86% = 104.99 pounds.