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question:The areas of three squares are 16, 49 and 169. What is the average (mean) of their side lengths?
answer:The side lengths of the squares are sqrt{16}=4, sqrt{49}=7, and sqrt{169}=13. The average of the side lengths is (4+7+13)/3=boxed{8}.The answer is: 8
question:Kim's TV uses 125 watts of electricity per hour. She runs it for 4 hours a day. If electricity cost x cents per kw/h how many cents does her TV cost to run for a week? If we know the answer to the above question is 49, what is the value of unknown variable x?
answer:Kim's TV uses 125 watts of electricity per hour. She runs it for 4 hours a day, so the total number of watt-hours used per day is 125 * 4 = 500 watt-hours. To convert watt-hours to kilowatt-hours, we divide by 1000: 500 / 1000 = 0.5 kilowatt-hours. The cost of electricity is x cents per kilowatt-hour, so the cost of running the TV for a day is 0.5x cents. To find the cost of running the TV for a week, we multiply the daily cost by 7: 7 * 0.5x = 3.5x cents. We are given that the cost of running the TV for a week is 49 cents, so we can write: 3.5x = 49. Solving for x, we get: x = 14. The value of x is 14. 14 The answer is: 14
question:Yanna bought 60 apples. She gave eighteen apples to Zenny. She gave six more apples to Andrea and kept the rest. How many apples did she keep?
answer:Yanna bought 60 apples. She gave 18 apples to Zenny, so she has 60 - 18 = 42 apples left. She gave 6 more apples to Andrea, so she has 42 - 6 = 36 apples left. Yanna kept 36 apples. 36 The answer is: 36
question:w many three-digit positive integers are there that consist only of the digits 2 and/or 5?
answer:We have two choices for each of the three digits in the number, so there are 2^3=boxed{8} possible three-digit positive integers.The answer is: 8