Question: A chocolate box contains 200 bars. Thomas and his 4 friends take 1/4 of the bars and decide to divide them equally between them. One of Thomas's friends doesn't like chocolate bars very much and returns 5 of his bars to the box. Later, his sister Piper comes home and takes 5 fewer bars than those taken in total by Thomas and his friends so she can also share with her friends. What's the total number of bars left in the box? Think carefully first, then make a decision:
Thomas and his friends took 1 / 4 * 200 = 50 bars. The total number of bars left in the box was 200 - 50 = 150 bars. Since there are five of them sharing, each of them got 50 / 5 = 10 bars. After a friend returned 5 bars, there were 150 + 5 = 155 bars in the box. Piper took five fewer bars, that is 50 - 5 = 45 bars. The total remaining bars left in the box is 155 - 45 = 110 bars. So the answer is 110.