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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?

Respuesta :

irspow

Answer:

Step-by-step explanation:

t/4+t/3=1

(3t+4t)/12=1

7t/12=1

7t=12

t=12/7

x=(12/7)hours

dhoadl02

Answer:

1/4 + 1/3 = 1/x

Step-by-step explanation:

"Bethany can mow her family’s lawn in 4 hours."

In 1 hour, she does 1/4 of the job.

"Her brother Colin can mow the lawn in 3 hours."

In 1 hour, he does 1/3 of the job.

When they work together, in 1 hour they do 1/4 + 1/3 of the job.

When they work together, they can mow the lawn in x hours.

In 1 hour, they do 1/x of the job. This means that 1/4 + 1/3 must equal 1/x.

1/4 + 1/3 = 1/x

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