Bethany can mow her family’s lawn in 4 hours. Her brother Colin can mow the lawn in 3 hours. Which equation can be used to find the number of hours, x, it would take for Bethany and Colin to mow the lawn together? Rate
(Lawns per Hour)
Time
(Hours)
Fraction Completed
Bethany
One-fourth
x
One-fourth xx
Colin
One-third
x
One-third xx

3 + 4 = x
One-fourth x minus one-third x = 1
One-fourth x + one-third x = 1
4 minus 3 = x