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

### Instruction:
Dexter filled 3 fewer plastic boxes with football cards than basketball cards. He filled 9 boxes with basketball cards and each box has 15 cards. For the boxes with football cards, he filled each box with 20 cards. How many cards does Dexter have in total?

### Response:
 Idadi ya kadi za mpira wa kikapu ni 9 x 15 = <<9*15=135>>135 kadi.
Dexter ana masanduku 3 ya plastiki chini ya kadi za mpira wa miguu, hivyo alizijaza masanduku 9 - 3 = <<9-3=6>>6 ya plastiki na kadi za mpira wa miguu.
Idadi jumla ya kadi za mpira wa miguu ni 6 x 20 = <<6*20=120>>120 kadi.
Hivyo, Dexter ana jumla ya kadi 135 + 120 = <<135+120=255>>255.