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    18 packets of sweets and 12 boxes of sweets in a carton
    mean number of sweets in all 30 packets and boxes is 14
    mean number of sweets in the 18 packets is 10

    work out the mean number of sweets in the boxes


    How???
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    To work out the mean, you have to do the total / the number of 'things' you have, in this case the packets or boxes, so in this question we have to work backwards and multiply the mean with the number of packets/boxes.

    Here's my answer (hope it's right!):
    total number of sweets = 30 x 14 = 420
    number of sweets in packets = 18 x 10 = 180
    therefore, the number of sweet in boxes = 420 - 180 = 240
    so the mean of the sweets in boxes = 240 / 12 = 20
 
 
 
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