Johannes owns a vegetable shop, he sells cabbage for $2 per kilogram. If Johannes was able to earn $30 last Wednesday, $24 last Friday, and $42 today, how many kilograms of cabbage was he able to sell? Let's think first. Chain of thought:
Johannes was able to sell $30 / $2 = 15 kilograms last Wednesday. He was able to sell $24 / $2 = 12 kilograms last Friday. And he was able to sell $42 / $2 = 21 kilograms today. Therefore, Johannes was able to sell is 15 + 12 + 21 = 48 kilograms of cabbage.
Therefore, the answer is 48.