Q: Evelyn’s family watched 10 hours of television last week. The week before, they watched 8 hours of television. If they watch 12 hours of television next week, what is the average number of hours of television that they watch per week?
A: Over the three weeks, they will have watched a total of 10 + 8 + 12 = 30 hours of television. The average number of hours per week is 30 hours / 3 = 10 hours of television. The answer is 10.

Q: Out of the 150 students, 60% are girls and the rest are boys. Only 1/3 of the boys joined varsity clubs. How many of the boys did not join varsity clubs?
A: Out of the 150 students, 100% - 60% = 40% are boys. So, there are 150 x 40 / 100 = 60 boys. Out of the 60 boys, 60 x 1 / 3 = 20 joined varsity clubs. Therefore, 60 - 20 = 40 boys did not join varsity clubs. The answer is 40.

Q: I bought a TV for $1700 excluding tax. What is the price of the television when calculating 15% of the value-added tax?
A:
The value - added tax is 1700 * 15% = 255. The price of the television including tax 1700 + 255 = $1955. The answer is 1955.