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Answer:
3:1
Step-by-step explanation:
Looking at the numbers
39 and a ratio of 10:3 kinda scream that there are 30 adults and 9 children to me, but when 3 adults get off, that is only 36 people.
this means,
27 adults,
and
9 children
so if it doesn't look obvious enough, 9 x 3 is 27, so that means that 3: 1 must be our ratio because the 3 in 3:1 multiplied by 9 is 27 which is the number of adults, and the 1 in children multiplied by 9 is 9!
so there you have it, 27/9 = 3
and
9/9=1
so
3: 1