Question

What happens to the force of gravitational pull if we tripled the distance and one of the masses is doubled

Answer 1

This depends on the original mass of the object having its mass doubled and the the original distance before the distance was tripled.

Answer 2

Triple the distance ... The force drops to 1/9 of the original force.

Double one mass ... The original force doubles.

Do both ... The original force becomes 2/9 as strong, = about 22.2% of what it was originally.