John can paint a house in 10 hours. Adam can paint the same house in 15 hours.
A. Write an equation that can be used to find the time in hours, t, it would take John and Adam to paint the house together.
they each paint a fraction of the house ... the fractions add to one
t / 10 + t / 15 = 1
3t / 30 + 2t / 30 = 1
5 t = 30