get a scale, weight the weed out of the packets, if its what you asked for and you like the stuff then enjoy, if its not then take your weed w/ receipt to the store and ask for a refund, or tel the cops you got ripped off on drugs
learn your grams. for me, i never paid anymore than $10 (canadian) a gram. for most dealers, when you buy in bulk they'll sell you more for less; so a quarter (quarter of an ounce which is 7 grams) would cost about $60. eventually you'll be able to tell how a gram should look; but buying anything over a gram i usually get the dealer to weight it out infront of me.
10 of those pouches for $35 sounds sketchy, but a good deal none the less. they look pretty hefty for their size.