Without any preconditions, it is impossible to calculate an accurate answer to this question. The solution idea is as follows: "How much did Mom spend on 3kg of tomatoes and 3kg of broccoli?" To know how much it cost, we need to know the prices of tomatoes, broccoli and orchids respectively. The final calculation formula is: tomato price *3+ broccoli price *3.

It can be estimated briefly: the price of tomatoes is generally around 1.5 yuan, generally between 1 yuan and 2 yuan; The price of broccoli is uncertain, which is greatly influenced by the origin and quality. The price ranges from 1 yuan to 1 yuan. Moreover, both vegetables need to consider the time to market, and the price of vegetables may be adjusted in winter.