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.
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=
<gadget id="calculator">40-5</gadget>
<output>35</output>
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=
<gadget id="calculator">3/5*35</gadget>
<output>21</output>
21 years old in 15 years.
Currently, Oscar is 21-15=
<gadget id="calculator">21-15</gadget>
<output>6</output>
6 years old.

<result>6</result>