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

### Instruction:
For Roger's phone to function optimally, he can have a maximum of 50 apps on his phone. However, the recommended number of apps is 35. If Roger has twice the recommended number of apps, how many apps must he delete for his phone to function optimally again?

### Response:
 Ikiwa kiwango kilichopendekezwa cha programu ni 35, kuwa na mara mbili ya kiwango hicho kunamaanisha Roger ana programu 2*35 = <<35*2=70>>70 kwenye simu yake.
Kwa kuwa simu ya Roger inaweza kufanya kazi vizuri tu na programu 50, anahitaji kufuta 70-50 = <<70-50=20>>20 programu.