 
 <translate> Question: Angela wants to check her math homework answers with her friends, but some of them aren't done yet. Out of 20 problems, Martha has finished 2, Jenna has finished four times the number Martha did minus 2, and Mark has finished half the number Jenna did. If none of the friends worked on any of the same problems, how many problems have no one but Angela finished? Think carefully first, then make a decision: <hau> Tambaya: Angela tana son ta bincika amsoshin aikin gida na lissafi da abokanta, amma wasu ba su gama ba tukuna. Daga cikin 20 matsalolin, Martha ta gama 2, Jenna ta gama sau hudu na lambar da Martha ta yi -2, kuma Mark ya gama rabin lambar da Jenna ta yi. Idan babu wani daga cikin abokai da ya yi aiki a kan wani daga cikin wannan matsala, da yawa matsaloli da ba wanda amma Angela gama? Ka yi tunani sosai da farko, sannan ka yanke shawara: 