Question

if half a kilogram of onions costs rs 20.how much will 300 grams of onions cost

Answer 1

500 gram onion cost = Rs. 20

1 gram onion cost = 20/500 
                              = 0.04

cost of 300 gram onion = 0.04 x 300
                                      = Rs. 12 

Answer 2

Solution:-

Solution through unitary method -

Cost of 500 gm of onions = Rs. 20
Cost of 1 gm of onion = Rs. 20/500
Cost of 300 gm of onions = Rs. (20*300)/500
= Rs. 6000/500
= Rs. 12
Cost of 300 gm of onions is Rs. 12
Answer.