Answer this question:A bicycle shop owner adds 3 bikes to her stock every week. After 1 month, she had sold 18 bikes but still had 45 bikes in stock. How many bikes did she have originally?
There are approximately 4 weeks in a month. The shop owner added 3 bikes every week for 4 weeks for a total addition of 3 * 4 = 12 bikes. The shop owner now has the original number of bikes + 12 bikes. She sold 18 bikes within the same time frame. She now has a total of 45 bikes which is: the original number of bikes + 12 - 18 = 45 bikes. The original number of bikes = 45 - 12 + 18 = 51 bikes.
The answer is 51.

Answer this question:Bob, a marathon runner, is preparing for a race. He runs a total of 70 miles in the 3 days leading up to the race. On day one he runs 20 percent of the total miles and on day 2 he runs 50 percent of the remaining miles. How many miles does he run on day three to complete the 70 miles?
Day 1: 70(.20) = 14 miles. 70 - 14 = 56 miles remaining. Day 2:56 / 2 = 28 miles. 56 - 28 = 28 miles remaining.
The answer is 28.

Answer this question:Mary has 400 sheep on her farm. She gave a quarter of her sheep to her sister, and half of the remaining sheep to her brother. How many sheep remain with Mary?
Mary gives 1 / 4 * 400 = 100 sheep to her sister. She now has 400 - 100 = 300 sheep remaining. She then gives 1 / 2 * 300 = 150 sheep to her brother. So 300 - 150 = 150 sheep remain.
The answer is 150.

Answer this question:Winston has 14 quarters. He then spends half a dollar on candy. How many cents does he have left?
Winston has 350 cents because 14 x 25 = 350. He spends 50 cents because $1 / 2 = 50 cents. He has 300 cents left at the end.
The answer is 300.