Shania is designing her own dress, and decides to make it a longer dress by extending the dress by 50% of its original length. She also adds 20cm to the bottom of the dress with a lace trim. If the final design is 140cm long then how long, in centimeters, was the dress in its original design?
Without the lace trim, the dress is 140cm full length – 20cm lace trim = <<140-20=120>>120cm.
Let's assume the dress was originally x cm in length.
Half the original length is x/2.
Adding the original length and the extended length, which is x+x/2 = 120
3/2x = 120
The orginal length is x= 80 cm
#### 80