Sara is younger than Robert by 8 years. If their ages are in the respective ratio of 3:5, how old is Sara?	Options:
A) 8	B) 10	C) 12	D) 15	E) 20
Let Robert's age be x years   Then Sara's age = x-8 years   (x-8)/x = 3/5   x = 20   Sara's age = x-8 = 12 years   Answer is 12
<result>C</result>
Sara is younger than Robert by 8 years. If their ages are in the respective ratio of 3:5, how old is Sara?