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Since the new average increases by 0.35 years, the difference in the sum of ages of the students who left and the new students should be: 70×0.35=24.5 years Option I: (38+19+29)−(15+21+27)=23 years So, option I cannot be the answer. Option II: (44+19+29)−(15+21+33)=23 years So, option II cannot be the answer. Option III: (30+19+29)−(15+21+20)=22 years So, option III cannot be the answer.
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