Working together

Question

(1 pt) You can paint a certain room in 9 hours. Your brother can do it in 2 hours. How long does it take the two of you working together? 

  a) Write an equation for the percent of the job completed after ttt hours of working together?

now solve the equation using appropriate units

Answer 1

Step 1:

A boy can paint a room in .

His brother does it in .

Find How long does it take to work together.

Let represents the work in hours.

A boy can paint a room in hours.

His brother can do same work in hours.

Thus, together can do in the work is

Solve the equation.

Solution:

A boy and his brother can paint a room in to finish the job.