Two light plastic bags of negligible mass are placed 2 meters apart. Each bag contains 15 mangoes. If 10 mangoes were moved from one bag to the other, the gravitational force between the two bags would
 increase to 3/2 the original value.
 decrease to 2/5 the original value.
 increase to 5/3 the original value.
 decrease to 5/9 the original value.
 not change
From Newton's law of gravitational interaction, we know the gravitational force between two objects in the surface of Earth,
(where G is a universal constant known as gravitational constant, M and m are the masses of the two objects and r, the distance between them)
Suppose each mango weighs x kg.
The ratio of gravitational forces in the two cases described above would be:
Therefore, `F_2=5/9 F_1 `
Thus the correct answer is at option 4).