Final answer:
To find the cost of each eyelash pack, subtract the cost of the eyelash glue from the total money spent, and then divide it by the number of eyelash packs. In this case, each eyelash pack costs $5.
Step-by-step explanation:
To find the cost of each eyelash pack, we need to subtract the cost of the eyelash glue from the total money spent and then divide it by the number of eyelash packs. In this case, the eyelash glue cost $10, so the remaining money is $75 - $10 = $65. This $65 is divided by 13, which gives $65 / 13 = $5. Therefore, each eyelash pack costs $5.