Test your numerical literacy

How good are you with numbers? These questions, roughly in increasing order of difficulty, test your mathematical thinking and familiarity with numbers.
The answers are here.

NOTE: No calculators!!!

1. How many zeros are in 60 trillion?


2. 466-209=?


3. What number is halfway between 75 and 105?


4. To the nearest hundred, how many yards are in a mile (1 mile = 5280 feet)?


5. A month starts on Wednesday. What is the most number of Tuesdays it can have?


6. How many piano keys are pressed in this video?


7. Is 176/289 a passing score (passing is 65%)?


8. Printing a piece of paper costs $.03 per sheet. How many pages can I print (single-sided) with $20.00?


9. Light travels at 300000 km per hour. The moon is 240000 miles away. If we were to shine a light at the moon that bounces back, how long would it take to see it again from the time we begin shining it?


10. How many pennies can fit into a 30 gallon fish tank?


11. Estimate the number of days from November 15th, 2009 to April 11th, 2011.


12. In seven months so far, this video of Susan Boyle's audition on Britain's Got talent has received 78 million views. At this rate, how many views will it have by the end of next year?


13. How many years would it take for me to drive to the sun at 60 mph?


14. John works 50 hours a week, and gets $75000 a year after 30% income tax. If he is paid every two weeks, what should the gross income be on his paycheck?


15. A company discounts the price of a $100 item by 10% and then raises it by 10% again. How many times must this be repeated for the item to only cost $1?


16. The rule of 72 states that if money is invested at x%, then it will double in worth in 72/x years. For example, $100 at 3% interest will become $200 in approximately 72/3=24 years. For higher interest rates, does the rule overestimate or underestimate the time required?


17. What should the poverty rate be for a family of four?


18. One person has swine flu. Every day he spreads it to three other people. Assume that these other three people (along with the original person) each spread it to three more people the next day. If this keeps happening, how long would it take the entire US to be affected?


19. What is the 1000th term of this sequence: 2, 3, 6, 8, 8, 4, 2, 8, 6, 8, ... (hint: Fibonacci)


20. Which is greater, 2^222 or 22^22?

Answers will be posted Monday!