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

### Instruction:
 Nico anakopa vitabu 3 kutoka maktaba siku ya Jumatatu. Siku ya Jumatatu, anasoma kitabu cha kwanza chenye kurasa 20. Siku ya Jumanne, anasoma kitabu cha pili chenye kurasa 12. Siku ya Jumatano, anasoma kitabu cha tatu. Ikiwa amesoma jumla ya kurasa 51 kuanzia Jumatatu hadi Jumatano, alisoma kurasa ngapi siku ya Jumatano?


### Response:
 Nico alikopa vitabu 3, hivyo alisoma jumla ya kurasa 20 + 12 + X = <<20+12+X=51>>51 kuanzia Jumatatu hadi Jumatano.
Hivyo X = 51 - (20 + 12) = <<51-(20+12)=19>>19 kurasa.