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

### Instruction:
John's piggy bank contains quarters, dimes, and nickels.  He has three more dimes than quarters and 6 fewer nickels than quarters.  If he has 63 coins, how many quarters does John have?

### Response:
 John ana sarafu 63 kwa jumla.
Ikiwa ana dimu 3 zaidi ya robo, basi ana robo + 3 = <<3+robo=4>>4 robo.
Ikiwa ana nikeli 6 chini ya robo, basi ana robo - 6 = <<robo-6=2>>2 robo.
Kwa kuwa idadi ya robo ni sawa katika mifumo yote, tunaweza kuitumia kutatua idadi ya robo:
4 = 2
Kwa hiyo, John ana robo 4.