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

### Instruction:
At least a third of Fred's marbles are dark blue. All of the rest are red, except for 4 that are green. If he has 63 marbles, how many of them are red?

### Response:
 Angalau theluthi moja ya mabulinge ya Fred ni ya bluu ya kiza.
Hebu tufikirie kwamba theluthi moja tu ya mabulinge ya Fred ni ya bluu ya kiza.
Kwa hiyo, 2/3 ya mabulinge ni nyekundu na 4 ni ya kijani.
2/3 ya 63 = <<2/3*63=42>>42 ni nyekundu na 4 ni ya kijani.
Hivyo, kuna 42 + 4 = <<42+4=46>>46 mabulinge nyekundu.