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

### Instruction:
 Ruel ana vitabu vinne vya stempu 10 na vitabu sita vya stempu 15. Ana stempu ngapi Ruel?


### Response:
 Ruel ana jumla ya stempu 4 x 10 = <<4*10=40>>40 kutoka kwenye vitabu vinne.
Ana pia stempu 6 x 15 = <<6*15=90>>90 kutoka kwenye vitabu sita.
Hivyo, jumla ya stempu anazo ni 90 + 40 = <<90+40=130>>130.