A little worker has a metal alloy that is 20% copper in another hour we got a 60% copper. How many kilograms of each alloy sugar metal worker come by to create 90 kg of a 52% copper alloy?

3382-299=3383- ? fill in the blank?

Dots sells a total of 279 t-shirts ($2) and shorts ($4). in april total sales were $670. how many t-shirts and shorts did dots sell?

Sandy is upgrading her internet service. fast internet charges $20 for installation and $52.45 per month. quick internet has free installation but charges $57.45 per month. part 1 out of 2 complete the equation that can be used to find the number of months after which the internet service would cost the same. use the variable x to represent the number of months of internet service purchased.