Question

If Alex and Brandon work together, they will clean the school in 15 hours. Working alone, Brandon can finish the same job in 20 hours. How long will it take Alex to do the job by himself?

Answer 1

I think it is 5 but don't take my word for it

Explanation:

I think you minus 20 - 15 which equals to 5 so 20 - 15 = 5 hopefully i was a little helpful just try that if its not correct i'm so sorry i will practice my math and answer this question again thank you for being so understanding

Answer 2

Correct answer: Alex can finish the same job in 60 hours

Explanation:

The appropriate equation for this situation is:

1/20 + 1/x = 1/15 => (x + 20) / 20x = 1/15 => 15 · (x + 20) = 20x =>

15x + 300 = 20x => 5x = 300 => x = 300/5 = 60 hours

x = 60 hours

God is with you!!!