 <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: <yor> Ìbéèrè: Angela fẹ́ bá àwọn ọ̀rẹ́ rẹ̀ ṣàyẹ̀wò àwọn ìdáhùn tó ti rí nínú iṣẹ́ àṣetiléwá rẹ̀ nípa ìṣirò, àmọ́ àwọn kan lára wọn ò tíì parí rẹ̀. Lára àwọn ìṣòro ogún, Martha ti parí méjì, Jenna ti parí ìlọ́po mẹ́rin iye tí Martha ṣe àyínìke méjì, Mark sì ti parí ìdajì iye tí Jenna ṣe. Bí kò bá sí ọ̀kan nínú àwọn ọ̀rẹ́ náà tó ṣiṣẹ́ lórí àwọn ìṣòro kan náà, àwọn ìṣòro mélòó ni kò sẹ́ni tó tíì yanjú àyàfi Angela? Kọ́kọ́ ronú dáadáa, kó o wá ṣèpinnu: 