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

### Instruction:
 Grayson ana maswali 100 kwenye mtihani. Anajibu baadhi ya maswali kwa masaa 2, akichukua dakika mbili kwa kila jibu, kisha anagundua kuwa hajui maswali mengine. Anawacha maswali mangapi bila kujibiwa anapowasilisha mtihani wake?


### Response:
 Masaa mawili ni dakika 60 * 2 = <<60*2=120>>120.
Ikiwa kila swali linachukua dakika mbili, basi Grayson anajibu maswali 120 / 2 = <<120/2=60>>60.
Maswali yasiyojibiwa ni 100 - 60 = <<100-60=40>>40 maswali.