A metalworker has a metal alloy that is 30​% copper and another alloy that is 70​% copper. How many kilograms of each alloy should the metalworker combine to create 60 kg of a 62​% copper​ alloy?

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.