How I figured it out was:
1 adult+1 child=40 kgs
so 10 adults + 10 children = 400kg
so 10 adults + 10 children = 400kg
then if i had another 2 adults + 2 children = 80kg
being 12 adults +12 children = 480kg
by adding 1 more child 15kg
in total would be 12 adults and 13 kids giving a total of 495kg
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