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

### Instruction:
On a particular day, Rose's teacher read the register and realized there were twice as many girls as boys present on that day. The class has 250 students, and all the 140 girls were present. If all the absent students were boys, how many boys were absent that day?

### Response:
 Jumla ya wanafunzi katika darasa ni 250.
Idadi ya wasichana waliohudhuria ni 140.
Idadi ya wavulana waliohudhuria ni 140/2=<<140/2=70>>70.
Idadi ya wavulana wasiohudhuria ni 250-70=<<250-70=180>>180.