Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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.

### Response:
 Baada ya miaka mitano, umri wa Christina utakuwa 1/2 * 80 = <<80*1/2=40>>40 miaka.
Ikiwa baada ya miaka mitano Christina atakuwa na umri wa miaka 40, kwa sasa ana umri wa 40 - 5 = <<40-5=35>>35 miaka.
Oscar atakuwa na umri wa 3/5 * 35 = <<3/5*35=21>>21 miaka baada ya miaka 15.
Kwa sasa, Oscar ana umri wa 21 - 15 = <<21-15=6>>6 miaka.