To make a picadilla Isabel I buy 1.2 kg of meat and 4 bags of 3.5 kg arracache, how many kg of ingredients do I buy in total?

To calculate the total weight of the ingredients, you simply add the weight of the meat and the weight of the arracache. You have 1.2 kg of meat and 4 bags of arracache each weighing 3.5 kg. So, the total weight of the arracache is 4 * 3.5 kg = 14 kg. Therefore, the total weight of the ingredients you bought is 1.2 kg (meat) + 14 kg (arracache) = 15.2 kg.