Solution
The weight of 9 balls = 500 + 500 + 800 = 1800 g
Weight of 1 ball = 200 g
Weight of 5 balls = 1000g
PS: The figure may not be clear. We are replacing it with a more clear figure.
The figure is not clear on right hand side it is actually 800+500+500= 1800 kg
left side = 9 balls
so 1 ball weight is 1800 /9 = 200 kg
5 balls = 1000 kg
answer D
It should be 5. 3 removed from center triangle and 2 joining the top of the 3 triangle on the bottom there remains 4 triangles : 3 on the bottom and 1 outer triangle