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The average age increased by 0.4 years. So, the difference of sum of ages of new student to the age of old student = 70*0.4 = 28 years (19+32+__x___) - (20+22+__y__) = 28 (x-y) + (51-42) = 28 x-y = 19 So, option I, II, and III all satisfy the above relation Hence, all three will be the answer.
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