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

### Instruction:
 Angela anataka kuangalia majibu ya kazi yake ya hesabu na marafiki zake, lakini baadhi yao bado hawajamaliza. Kati ya maswali 20, Martha amemaliza 2, Jenna amemaliza mara nne ya idadi ya maswali aliyomaliza Martha minus 2, na Mark amemaliza nusu ya idadi ya maswali aliyomaliza Jenna. Ikiwa hakuna rafiki yeyote alifanya maswali yale yale, maswali mangapi yamefanywa na Angela pekee?


### Response:
 Martha amemaliza maswali 2, hivyo Angela yuko maswali 20 - 2 = <<20-2=18>>18 mbele yake.
Mara nne ya idadi ya maswali aliyomaliza Martha ni 4 x 2 = <<4*2=8>>8.
Hivyo, Jenna amejibu maswali 8 - 2 = <<8-2=6>>6.
Idadi ya maswali aliyomaliza Mark ni 6 / 2 = <<6/2=3>>3.
Jumla ya maswali ambayo Martha, Jenna, na Mark wamejibu ni 2 + 6 + 3 = <<2+6+3=11>>11.
Hivyo, hakuna rafiki yeyote wa Angela aliyemaliza maswali 9 kati ya maswali 20.