Question
A crate which contains 7 similar packets of brown rice and 4 similar packets of black beans has a mass of 5 kg 170 g. The crate alone is 520 g. Each packet of brown rice has a mass of 390 g. Find the mass of each packet of black beans in kg.
3 m

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A crate which contains 7 similar packets of brown rice and 4 similar packets of black beans has a mass of 5 kg 170 g. The crate alone is 520 g. Each packet of brown rice has a mass of 390 g. Find the mass of each packet of black beans in kg.