If the distance between the two spherical bodies is increased to four times, then by how many times, the mass of one of the bodies to be changed to maintain the same gravitational force ?

Explanation

To solve the problem, we need to analyze the gravitational force between two spherical bodies and how it changes when the distance between them is altered.

### Step-by-Step Solution:

1. **Understanding the Gravitational Force Formula**:
The gravitational force \( F \) between two masses \( M_1 \) and \( M_2 \) separated by a distance \( r \) is given by the formula:
\[
F = \frac{G M_1 M_2}{r^2}
...