Arectangular swimming pool is 15 meters long, 10/1/2 meters wide and 2/1/2 meters deep. what is its volume

The equation to find the Volume of something is length*Width*height
therefore:
(I'm confused as to what 10/1/2  means so)

•on the assumption that 10/1/2 means 10 and a half - 10.5
then it would be - 15*10.5*2.5 = 393.75m^3

•on the assumption that 10/1/2 means 10 divided by 1/2 then it would be:
15*20*4 = 1200m^3

Just a question- could you organize the data better? i just cannot tell which number are for which bakery. i will be happy to answer this question if you could do this for me! : )

The answers are 20,30,80,180,960,890,1230,4560. on the first row