Building mini ramp: cinder block questions

[mojo]

The ramp is 8'w x 24'l not counting the decks. How many cinder blocks will I need to properly support the ramp? My yard is fairly downward sloping. I can handle the leveling, just am. It sure how many blocks total to use. Thanks.

[samm]

I used to have a mini ramp that was those same dimensions and it was supported by 12 cinder blocks. 8 under the ramp part. and 2 more on each end for the posts that held up the decks.