Question

For 9 cows, 13 kg 500 g of food supplement are required every day. In the same proportion, how much will be needed for 12 cows?

Answer 1

Let the food supplement required for 12 cows be x kg. 

The quantity of food supplement required and the number of cows are in direct proportion. 

∴ (13kg500gram)/9 = xkg./12

∴ 13.5/9 = x/12 ….(13 kg 500 gram = 13.5 kg) 

∴ 13.5 × 12 = 9x ….(Multiplying both sides by 9 x 12) 

∴ (13.5 x 12)/9 = x 

∴ x = 18 

∴ The food supplement required for 12 cows is 18 kg.