$1.$ I worked out $23 percent$ of all disasters that took place in Europe ($313$)
$0.77$ x $313$ $=$ $241.01$
$2.$ I then worked out $18percent$ of European disasters that were storms ($241.01$)
$0.82$ x $241.01$ $=$ $196.882$
I'm not sure what to do from then...
In year 3 we have a total of 313 disasters, of which 23% took place in Europe. Ie,$(313)(0.23)= 72$ disasters in Europe.
Of the 72 disasters in Europe, 18% were storms, so, there were $(72)(0.18)= 13$ storms in Europe in year 3.
By the way, the multiplication does not give those exactly but within a few decimals, you would have to round because a disaster is not something you can have half of for example.
But 131 storms took place in total so that is $131-13=118$ storms took place in the rest of the world.