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

### Instruction:
Grayson has 100 questions on a test. He answers some of the questions for 2 hours, taking two minutes for each answer, then realizes he doesn't know the rest of the questions. How many questions does Grayson leave unanswered when he submits his test?

### 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.