Kimber and Andy each can assemble 12 circuit boards in one hour. Kimber
works for 6 hours and Andy works for 12 hours. How many more circuit
boards does Andy assemble than Kimber?

andy had 72 more circuit boards done than kimber

Step-by-step explanation:

ok so if they both can get 12 circuit boards done in one hour. kimber gets 12*6= 72 circuit boards done in 6 hours and stops working. and andy keeps working so at 6 hours she has the same amount which is 72 circuit boards done than she also works another 6 hours so she has 144 circuit boards done in 12 hours.