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

### Instruction:
Emilia needs 42 cartons of berries to make a berry cobbler. She already has 2 cartons of strawberries and 7 cartons of blueberries in her cupboard. She decides to go to the supermarket to get more cartons. How many more cartons of berries should Emilia buy?

### Response:
 Unapoweka pamoja makaratasi ya matunda ya bluu na matunda ya matunda, unapata makaratasi 2 + makaratasi 7 = <<2+7=9>>9.
Kwa kuwa Emilia anahitaji makaratasi 42 na tayari ana makaratasi 9, anapaswa kununua makaratasi 42 - makaratasi 9 = 33 ya matunda ya matunda.