Um, just smoking marijuana won't teach you math.
Not smoking it, buying it. An 8th for 25 if its regs, mids is 40 a quarter. Any idea how much an 8th would be for mids?
Simple math. A quarter is 2 8ths, so then just take 40 divide by 2 and DING 20 an 8th for mids. See, Math?
Besides I'd rather cook with weed than smoke it anyways. Special cookies for din-din :D