I did this with a 3 by 3 grid - not including headings (like a times table grid)
The headings along the top are left right and total
The headings down the side are like jazz, dislike Jazz and total
Then i filled in what I was given and worked out the rest.
12 are right-handed
Of these....2 dislike jazz
So.....10 must like jazz
And since 15 total like jazz....5 of those must be left-handed