The muscles of an adult make up 40% of the total body weight. What is the muscle mass of a 40

The muscles of an adult make up 40% of the total body weight. What is the muscle mass of a 40-year-old man if his weight is 90 kg.

1. The condition of the problem says that the weight of a 40-year-old man is 90 kg. This mass is 100% of its weight.

2. Now let’s find out what the muscle mass of this man is, if we know that it makes up 40% of the total body weight. Let’s write the calculation:

90 kg – 100%;

x kg – 40%.

90 * 40 = 100 * x;

3600 = 100 * x;

x = 3600/100;

x = 36 kg.

Answer: This man’s muscle mass is 36 kg.