 
 <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: <ibo> Ajụjụ: Angela chọrọ ka ya na ndị enyi ya tụlee azịza nke ihe omume e nyere ya ime n'ụlọ n'ihe ọmụmụ mgbakọ na mwepụ, ma ụfọdụ n'ime ha ka dị. N'ime nsogbu iri abụọ ahụ, Martha rụchara abụọ, Jenna rụchara okpukpu anọ nke Martha gbatara abụọ, Mark rụkwara ọkara nke Jenna. Ọ bụrụ na ọ dịghị enyi ọ bụla rụrụ ọrụ n'otu nsogbu ahụ, nsogbu ole ka ọ bụ nanị Angela rụzuru? Buru ụzọ chee echiche nke ọma, kpebizie ihe ị ga-eme: 