 
<translate> Ganin ra'ayin tunani na hankali, samar da tambaya mai ma'ana da amsa. Dalilin: Nathan zai iya yin 20 x 2 = 40 ya zauna. Adadin Ken da Nathan sun hada da 20 + 40 = 60 zaune-up. Bob zai iya yin 60 / 2 = 30 zama-up. Bob zai iya yin 30 - 20 = 10 more sit - ups fiye da Ken.  Tambaya da amsa: <eng> 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: 