She will most likely use a Mental set to accurately estimates the number of paint she will needs to paint her room.
A Mental set refers to way of approaching a problem in a way that has been successful made in the past which will be helpful in solving a new problem.
She may have to ask someone who have used a paint to decorate their room in order to have a good estimate of needed paint.
Therefore, she will most likely use a Mental set to accurately estimates the number of paint she will needs
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