 <translate> Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: Nathan can do 20 x 2 = 40 sit ups. Ken and Nathan's combined number is 20 + 40 = 60 sit - ups. Bob can do 60 / 2 = 30 sit - ups. Bob can do 30 - 20 = 10 more sit - ups than Ken.
 The question and answer: <yor> Níwọ̀n bó ti jẹ́ pé ohun tó wà lọ́kàn ẹ ló ń darí rẹ, béèrè ìbéèrè tó bọ́gbọ́n mu kó o sì dáhùn. Ohun tó mú kó rí bẹ́ẹ̀ ni pé: Nathan lè ṣe 20 x 2 = 40 sit-up. Àpapọ̀ iye ìgbà tí Ken àti Nathan ti ṣe bẹ́ẹ̀ jẹ́ 20 + 40 = 60 ìgbà tí wọ́n ti ṣe bẹ́ẹ̀. Bob lè ṣe 60/2 = 30 ìjókòó sókè. Bob lè ṣe 30 - 20 = 10 sit-up ju Ken lọ.  Ìbéèrè àti ìdáhùn: 