 
<translate> Bayyana tsarin tunani mataki-mataki sannan kuma amsar karshe. Dana tana da fensir 15 fiye da Jayden, wanda yake da ninki biyu na Marcus. Nawa ne Dana ke da fensir fiye da Marcus, idan Jayden yana da fensir 20? <eng> Give the step-by-step reasoning process and then the final answer. Dana has 15 more pencils than Jayden, who has twice as much as Marcus. How many more pencils does Dana have than Marcus, if Jayden has 20 pencils? 