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

### Instruction:
Three times the sum of marbles that Atticus, Jensen, and Cruz have is equal to 60. If Atticus has half as many marbles as Jensen, and Atticus has 4 marbles, how many marbles does Cruz have?

### Response:
 Mara tatu ya jumla ya mabulingo ambayo Atticus, Jensen, na Cruz wana ni sawa na 60, maana yake pamoja wana mabulingo 60/3=20.
Ikiwa Atticus ana nusu ya mabulingo ya Jensen, na Atticus ana mabulingo 4, Jensen ana mabulingo 2*4=8.
Jumla ya mabulingo ambayo Jensen na Atticus wana ni 8+4=12.
Cruz ana mabulingo 20-12=8.