Given:
In an asteroid field, 75% of the asteroids are carbonaceous asteroids.
There are 375,000 carbonaceous asteroids in the asteroid field.
To find:
The number of asteroids that are not carbonaceous.
Solution:
Let the total number of asteroids be x.
According to question,
Divide both sides by 0.75.
Asteroids not carbonaceous = Total asteroids - Carbonaceous asteroids
Therefore, 125,000 asteroids are not carbonaceous.