vuducthanhan26 vuducthanhan26

03-06-2021
Mathematics

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In a class there are 11 boys and 19 girls.
The mean weight of all 30 children is 32.85 kg.
The mean weight of the 11 boys is 31.9 kg.

Work out the mean weight of the 19 girls.

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headleymoore380 headleymoore380

03-06-2021

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explain two ways in which the preservation of natural environments adds quality of life in a country : ,

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