 
<translate> Dana nwere 15 pensụl karịa Jayden nwere 20, yabụ Dana nwere 20 + 15 = 35 pensụl. Jayden nwere pensụl iri abụọ nke bụ okpukpu abụọ karịa nke Marcus nwere ya mere Marcus nwere pensụl iri abụọ na ọkara = 10. Dana nwere 35 - 10 = 25 pensụl karịa Marcus. Azịza ikpeazụ ya bụ: 25. <eng> Dana has 15 more pencils than Jayden who has 20, so Dana has 20 + 15 = 35 pencils. Jayden has 20 pencils which is twice as much as Marcus's so Marcus has 20 / 2 = 10 pencils. Dana has 35 - 10 = 25 more pencils than Marcus.
The final answer: 25. 