 
 <prompt> Bill da Joan suka sha'awar da wani maktaba. A shekara ta 5 da suka gabata, Joan ta samu karatu guda biyu da Bill. Yanzu ta samu karatu guda biyu da Bill. Me karatu da Bill yake da yanzu? <response>: Let b ya kasance sanin shekaru na Bill da j ya kasance sanin shekaru na Joan. Mu san cewa j - 5 = 3(b - 5) da kuma j = 2b.
Bayanin daidaita maimakon wani rubutu a cikin maimakon wani rubutu, muna samu 2b - 5 = 3(b - 5)
Bayanin daidaita a cikin maimakon wani rubutu, muna samu 2b - 5 = 3b - 15
Sauran 15 da kuma dariya a kan kowane bakin, muna samu 2b + 10 = 3b
Bari 2b daga kowane bakin, muna samu 10 = b

Javaba shine 10. 