How many 11 by 17 inch blankets do you think one queen size blanket would make?

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I have an old ratty queen size blanket that has pretty much run it's course as a human blanket, and I will not waste it. I was thinking of cutting it up and making spca kittey cage blankets out of it. The blanket is one of those that are supposed to look like an old fashioned quilt. I only hope that by cutting it up it doesn't make it tear up more than I can mend.  If this turns out well I'll be asking on freecycle and craigs list and stuff for bedding and towls and such, so I can make more.