Question

The cost of 8 packets of salt , each weighing 400 grams,is Rs 36. What will be the cost of 20 packets if each packet weighs 1 kg

Answer 1

Cost of 8 packets of salt each weigh 400 g = rs.36
cost of 1 packet of salt weighing 400 g = 36/8 = rs. 4.5
cost of 400 g of salt = rs. 4.5
cost of 1000 g of salt = 4.5 *1000/400 = 45/4 = rs.11.25
cost of 20 packets of salt weighing 1kg each = 20 *11.25 = rs. 225

Answer 2

each packet cost of 400 g=36/8=Rs 4.5
each packet cost of 100 g=4.5/4
                                         =Rs 1.125

each packet cost of 1000 g(1 Kg)=1.125×10
                                                     =Rs 11.25
cost of 20 packets of 1 Kg=11.25×20
                                         =Rs. 225