A painter can finish painting a house in 7 hours. Her assistant takes 9 hours to finish the same job. How long would it take for

Question

3 years ago

10

them to complete the job if they were working together? Group of answer choices

1 answer:

frosja888 [35] · Answer 1 · 2022-06-21T05:13:13+03:00

Answer:

x=3 15/16 hours together

Step-by-step explanation:

the painter paints 1/7 of the house in 1 hour

the assistant paints 1/9 of the house in 1 hour

x=# of hours it takes them together to paint the house

(1/7)x+(1/9)x=1 (job finished)

multiply both sides by the LCM which is 63

63(1/7)x+63(1/9)x=63(1)

9x+7x=63

16x=63

x=63/16

x=3 15/16 hours together