In 2000 17 million workdays were lost due to strikes and labor disputes. In 2001 there were only 1 1/5 million days lost. How many more workdays were lost in 2000?

15 4/5?

Right.

If you convert the fractions to decimals, they're much easier to work with.

17 - 1.2 = 15.8 = 15 8/10 = 15 4/5