Marcus and his twin sister Marcie decide to save $25 each week to buy a video console. How long will it take for them to save $675? (1 point)

The twins save a total of $25 x 2 = $<<25*2=50>>50 each week.

Hence, Marcus and his twin sister will be able to save $675/ $50 per week = <<675/50=13.5>>13.5 weeks, rounded up to 14 weeks. Answer: \boxed{14}.