 
<translate> Ka yi la'akari da wannan tambayar. James yana da duwatsu 28. Ya sanya su a cikin jakunkuna 4. Yana saka lamba iri ɗaya a cikin kowace jaka. Sai ya ba da jaka ɗaya. Jimlar kwallo nawa ne James ya rage? Idan amsar ita ce "21"; bayyana dalilin: <eng> Consider the question. James has 28 marbles. He puts them into 4 bags. He puts the same number in each bag. He then gives one bag away. How many marbles does James have left?
 If the answer is '21'; explain the reasoning: 