The Gravitational Force $F$ Between Two Objects Is Inversely Proportional to the Square of to the Square

Essay

The gravitational force $F$ between two objects is inversely proportional to the square of the distance between the objects. If the force $F$ is $1.62 \times 10 ^ { - 6 }$ N when the two objects are $25$ cm apart, what is the gravitational force when the objects are $35$ cm apart?