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?
a) 3+4= x
b) 1/4 x- 1/3x =1
c) 1/4x+1/3x=1
d) 4-3= x

In 4 hours Bethany did the whole fraction 1 of the house.

In 1 hour he would do 1/4 of it.

In 3 hours Colin did the whole fraction 1 of the house.

In 1 hour he would do 1/3 of it.

In 1 hour they would both do (1/4 + 1/3)

If it takes both of them x hours to finish 1 whole fraction of the house.

In 1 hour they will both do   1/x

That means that:

1/x = 1/4 + 1/3

That is the equation.   x can be solved for.

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