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

### Instruction:
Tony has $87. He needs to buy some cheese, which costs $7 a pound and a pound of beef that costs $5 a pound. After buying the beef and his cheese, he has $61 left. How many pounds of cheese did he buy?

### Response:
 Alichagua kutumia $26 kwa sababu 87 - 61 = <<87-61=26>>26
Alichagua kutumia $21 kwa jibini kwa sababu 26 - 5 = <<26-5=21>>21
Alichagua kununua pauni 3 za jibini kwa sababu 21 / 7 = <<21/7=3>>3