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

### Instruction:
Isabella and Alexis went to the mall to buy some pants and dresses. Alexis bought 3 times more pants and dresses than Isabella. If Alexis bought 21 pairs of pants and 18 dresses, how many pairs of pants and dresses did Isabella buy in total?

### Response:
 Idadi ya suruali ambazo Isabella alinunua ni 21 / 3 = <<21/3=7>>7 jozi za suruali.
Idadi ya nguo za kike ambazo Isabella alinunua ni 18 / 3 = <<18/3=6>>6 nguo za kike.
Jumla ya jozi za suruali na nguo za kike ambazo Isabella alinunua ni 7 + 6 = <<7+6=13>>13.