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

### Instruction:
Cupcakes are sold in packages of 10 and 15. Jean bought 4 packs of 15 cupcakes.  If she will give one cupcake each to 100 children in the orphanage, how many packs of 10 cupcakes should she need to buy?

### Response:
 Jean tayari amenunua keki 15 x 4 pakiti = <<15*4=60>>60.
Anahitaji keki 100 - 60 = <<100-60=40>>40 zaidi.
Hivyo, anahitaji kununua pakiti 40/10 = <<40/10=4>>4 za keki 10.