i need to solve this problem with full details. help please

Module 4: Exemplary Level (2 marks) 8) Using a torsion balance similar to the Wire one used in the Cavendish Experiment, a group of scientists determined that the force of gravity between the small Q masses (q) and the large masses (Q) Mirror was 1.80 X 10 N when their separation distance (d) was 0.10 m. Suppose the Q separation distance (d) was then tripled to 0.30 m, what is the new force of gravity between q and Q? Light ray Explain your answer using words or proportionality equations