Answer:
the measure of AB =29 meters
20% off means it is selling for 80% of the original price ( 100% - 20% =80%)
Divide the sale price by 80% as a decimal:
380/0.80 = 475
The original price was $475
Justify:
Multiply the original price by 20% and subtract:
475 x 0.20 = 95
475-95 = $380 which is the sale price.
X/8-1/2=6
X/8=6+1/2=13/2
X/8=52/8
X=52