Alison buys 2 boxes of strawberries, box $$\(\mathbf{A}\)$$ and box $$\(\mathbf{B}\)$$. Box A contains 15 strawberries. The strawberries in box $$\(\mathbf{A}\)$$ have a mean weight of 24 grams. Box B contains 25 strawberries. The strawberries in box $$\(\mathbf{B}\)$$ have a mean weight of 18 grams. Alison puts all 40 strawberries into a bowl. Work out the mean weight of the 40 strawberries. grams

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