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Help with GCSE Maths question

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???
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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