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what topic does this question come under in gcse maths higher Watch

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    there are 27 boys and 18 girls, each holding coins in their hands
    the mean number of coins for the children is 13
    the mean number of coins for the boys is 9
    work out the mean number of coins for the girls

    is there a formula?
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    It comes under the topic averages (mean, median, mode)
    There are 45 children in total with each 13 coins, so 585 coins all together. All boys have 9 coins, so 9 times 27 is 243. 585 minus 243 is 342 coins (shared by 18 girls. 342 dicided by 18 is 19.
 
 
 
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