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

### Instruction:
Mona bikes 30 miles each week to stay fit. This week, she biked on Monday, Wednesday, and Saturday. On Wednesday, she biked 12 miles. On Saturday, she biked twice as far as on Monday. How many miles did she bike on Monday?

### Response:
 Jumatatu, alipanda maili x.
Jumatano, alipanda maili 12.
Jumamosi, alipanda maili 2x.
Jumla ya maili alizopanda = x + 12 + 2x = 30
3x + 12 = 30
3x = 30 - 12
3x = 18
x = <<18/3=6>>6 maili