Answer:
The brain of the newborn baby has a mass of about 377 grams.
Explanation:
Fractions are written as a ratio of two integers. For instance, a/b is a fraction.
Given the following parameters
Body mass = 2900 grams.
If the Brain mass of a newborn baby is about 13% of the mass of the newborn, then the mass of the brain is given as;
mass of brain = 13% of 2900
Mass of brain = 0.13 * 2900
Mass of brain = 377grams