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solve
the sum of the ages of the williams twin sisters and the bonney twin brothers is 60 years old. the bonneys are 8 years older than the williams girls. how old is each set of twins? hint: the sum of their ages includes each of the four children.
(select the correct answer)
(a.) the girls are 10, and the boys are 18
(b.) the girls are 11, and the boys are 19
(c.) the girls are 12, and the boys are 20