<human>:  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.
<bot>: How old will Christina be in five years? ** 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.
How old is Christina now? ** If in five years Christina will be 40, currently she is 40-5=<<40-5=35>>35 years old.
How old will Oscar be in 15 years? ** Oscar will be 3/5 times as old as Christina is now in 15 years, meaning he will be 3/5*35=<<3/5*35=21>>21 years old in 15 years.
How old is Oscar now? ** Currently, Oscar is 21-15=<<21-15=6>>6 years old.
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