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

### Instruction:
After Betty gave Stuart 40% of her marble collection, the number of marbles in Stuart's collection increased to 80. If Betty had 60 marbles, how many marbles did Stuart have initially?

### Response:
 Betty alimpa Stuart 60 * 40/100 = <<60*40/100=24>>24 maburungutu.
Kwa kuwa idadi ya maburungutu katika mkusanyiko wa Stuart baada ya zawadi kuongezeka hadi 80, basi awali alikuwa na maburungutu 80 - 24 = <<80-24=56>>56.