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

### Instruction:
 Duka la Bwana Julien lina mabulinge 400 yaliyosalia baada ya mauzo ya siku iliyopita. Wateja ishirini waliingia dukani, na kila mmoja alinunua mabulinge 15. Mabulinge mangapi yamesalia dukani?


### Response:
 Ikiwa kila mmoja wa wateja 20 alinunua mabulinge 15, basi walinunua jumla ya mabulinge 15*20=<<300=300>>300 kutoka duka la Bwana Julien.
Idadi ya mabulinge yaliyosalia dukani ni 400-300=<<400-300=100>>100 mabulinge.