Mary built a model ship. She spent 10 hours constructing the ship and 5 hours painting it, for what fraction of the total time did she spend painting the ship?  Choose the correct answer: A) 1/3 B) 1/5 C) 1/4 D) 2/3 E) 1/2
We don't need to get into calculations for solving this question. We can use the concept of weighted averages.   The average time for the entire project is 15 hours; so, she spent a lesser duration of time painting the ship than constructing it.   5---(5---5)   This shows that you can divide the entire project into 3 equal parts. Thus, 1/3 of the journey was spent painting.   1/3nswer: 1/3
<result>A</result>
Mary built a model ship. She spent 10 hours constructing the ship and 5 hours painting it, for what fraction of the total time did she spend painting the ship?