Gopal bought `3 1/2`kg of potatoes in the market if he paid 84 rs.then find the cost of 1 kg of potatoes.

Madhu buys 5 kg of potatoes at the market. If the cost of 2 kg is ₹36, how much will Madhu pay?

The cost of 1kg potatoes and 2 kg tomatoes was Rs. 30 on a certain day. After two days, the cost of 2 kg potatoes and 4 kg tomatoes was found to be Rs. 66.Identify the unknowns in each situation. We observe that there are two unknowns in each case.

Kishore bought 5 3/4 kg apples and 4 1/2 kg oranges then find the total weight in kgs.

Four particles of masses 1 kg, 2 kg, 3 kg and 4 kg are placed at the four vertices A, B, C and D of the square of side 1 m. Find the position of centre of mass of the particles.