A piece of chalk is 34/56 centimeter long. Brian breaks off 23/56 centimeter long. Sara added 12/56 centimeter to the chalk that was left. How long is the piece of chalk that is left? Write and solve an equation.

23/56 centimeters

Step-by-step explanation:

all of the variables have a common denominator, so you can effectively ignore the denominator when solving.

1. you start off with 34/56 centimeter of chalk and Brian breaks off 23/56 centimeters worth, leaving you with 11/56 centimeters

2. Sara then added 12/56 centimeters worth, making the final amount 23/56 centimeters of chalk

An equation to summarize all of this is:

i believe the correct answer is b.