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# tickets sold by 1 boy : # tickets sold by 1 girl
= 5: 3

ticket sales by 1 boy : ticket sales by 1 girl ( x $5 / ticket)
= 25 : 15

If there are u number of boys,
ticket sales by boys : ticket sales by girls
= 25u : 15 (20 -u)

Difference in ticket sales = 20

25u – 15(20-u) = 20
40u = 320
u = 8

# boys = 8; # girls = 12

Ref: http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=1813#p1813

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