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

### Instruction:
Bryan's score on a math exam is 20. Jen scored 10 more than Bryan while Sammy scored 2 fewer than Jen. If the math exam has 35 points in all, how many mistakes did Sammy make?

### Response:
 Jen alipata alama 20 + 10 = <<20+10=30>>30 kwenye mtihani.
Sammy alipata alama mbili chini, hivyo alama yake ilikuwa 30 - 2 = <<30-2=28>>28.
Hivyo, Sammy alifanya makosa 35 - 28 = <<35-28=7>>7.