Question
Riordan wanted to buy some oats. He will have $15 left if he buys 3 kg of oats. However, he will need $6 more to buy 6 kg of oats. What is the cost of 4 kg of oats?
4 m

Click button first when a symbol is required. X

Riordan wanted to buy some oats. He will have $15 left if he buys 3 kg of oats. However, he will need $6 more to buy 6 kg of oats. What is the cost of 4 kg of oats?