Ismarelda has enough money to purchase 25 bottles of root beer for a party at her house. she is expecting 3 guests. what is the largest number of bottles of root beer she needs to purchase if she wants everyone (including herself) to have an equal number of root beer?

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass