Question: Christina's age will be half of 80 years in five years to come. If Oscar will be 3/5 times as old as Christina is now in 15 years, calculate Oscar's age now. Think carefully first, then make a decision:
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Christina's age will be half of 80 in five years to come, meaning in five years, Christina's age will be 1 / 2 * 80 = 40 years. If in five years Christina will be 40, currently she is 40 - 5 = 35 years old. Oscar will be 3 / 5 times as old as Christina is now in 15 years, meaning he will be 3 / 5 * 35 = 21 years old in 15 years. Currently, Oscar is 21 - 15 = 6 years old. So the answer is 6.
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