In a grocery store, perla was challenged by a promo girl to identify which pack in a box of 25 packs of a liquid detergent is heavier than the rest. according to the promo girl, all packs in the box weigh the same except for one which is heavier. using only a balance scale, perla was challenged to identify the single heavier pack for a maximum of 3 weighing attempts only. how should perla weigh the 25 packs to successfully identify the heavier pack? ​