Poisoning someone's drink = math problem! (Janina is different!)

Janina's package arrived this afternoon: the envelope had interesting stickers of headphones, cows, dogs, butterflies, wells, buckets of water, the JACK AND JILL nursery rhyme, children, and "BE AN OPTIMIST PRIME - NOT A NEGATRON!" Hahaha! Inside was a card with various things: an "Experience the new better game" blue blank card with a pinball machine, BABYSITTER'S CLUB / Twisted Whiskers (cats / dogs / fire hydrant / bones / hairspray / "Dander B-Gone" spray) / scratch-n-sniff banana stickers, a "Mr. Lunch" cow / chicken / mouse with cheese envelope, a "World's Bliss" Maui postcard, a "What Dreams May Come" Hawaii postcard, a Raven Images wizard with a crystal ball postcard, a fairy postcard, a "Don't Freak Out" postcard, a "Let's Turn This Into A Math Problem" postcard featuring arsenic poison into a beverage (HAHAHAHA!), and a "human body" postcard featuring an "eater" / Diet Pepsi bottle / "lack of Diet Pepsi warning system."

The card itself had mini dog stickers, squirrel stickers, dog print stickers, bear stickers, bird stickers, "Excellent!" cherries stickers, and a sticker of Elmer Fudd playing basketball. She said, "Leslie - thought of you the other day, and threw together some fun stuff. I made the pinball machine blank card, and two of the postcards. Speaking of which, I hope you like the wizard and fairy postcards. The other two postcards are from a book of funky / odd postcards. I've been wanting to send you some different postcards - not just the usual city / town / state ones. I hope you like the stickers... I made the bear sticker at the bottom of this page - I figured it went along with the paw stickers. Haven't seen the new HARRY POTTER movie as of yet. Lately, we've been watching CSI and Law & Order DVDs. I love those shows - I find them to be the equivalent to comfort food. Off to do some grocery shopping! Have a cool day! Love, Janina."