Question

cost of groundnuts is directly proportional to its weight. If 10kg groundnuts is rs.400. Find the cost of 2 quintals of groundnut.

Answer 1

8000
2 quintal groundnut will cost 8000 rupees

Answer 2

1 quintal = 100kg ⇒ 2 quintals  = 200kg

10 kg groundnuts is rs.400. so 200kg groundnuts is x

10 / 400 = 200 / x   [they are in Direct Proportions ]

10x=400 *200

x =400*200/10

x = Rs 8000 is the cost of 2 quintals of groundnut. ANS