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  Boys Girls Adults
Number of people 5u 4u 3u
Number of toffees 20u = 4 x 5u 8u = 2 x 4u 3u
Since ratio of boys to girls is 5:4, we can use 5u:4u.
That means children is 9u. As they make up 3/4 of the people,
that means number of adults must be 3u.

Number of toffees given = 20u + 8u + 3u = 31u = 465 so u = 15.
Number of children = 9u = 9 x 15 = 135.
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