In a scale drawing for a garden, 2cm =1m. If the garden measures 8cm by 10cm in the drawing, how large will it be in reality?
If the scale is 2cm = 1m, then every 1cm in the drawing represents 0.5m in reality.
So, if the garden measures 8cm by 10cm in the drawing, it will measure 8cm * 0.5m = <<8*0.5=4>>4m by 10cm * 0.5m = <<10*0.5=5>>5m in reality. Answer: \boxed{4m \text{ by } 5m}.