Mathematics Trivia

13

Let's say a pizzeria charges for their pies proportional to the size of the pie. If a 10" pizza costs $10, then what should a 12" pizza cost?

3

If, after receiving a 20% discount when buying a television set, and after paying 7% tax, you paid $642, what was the original marked price of the TV set?

9

If you looked at a clock in the mirror and the time on the clock face appeared to read 8:20, what time would it be in reality?

15

What will be the units digit of the number represented by 3 to the 24th power?

15

Three kids put up their own money to make a lemonade stand: the first kid puts up $6, second $3, and the last $1. If they take in $100 and share the profits equally, how much of the $100 will go to the first kid?

5

If you give me $100, then I will have half as much money as you, but if I give you $100, then you'll have five times as much money as I do. How much does each of us have now?

15

A jogger can run down a hill five times as fast as she can run up the hill. If a round-trip jog up and down a hill takes one and one-half hours, how long does it take her to descend the hill?

18

An airplane departs at exactly 8:08:08 a.m. and arrives at its destination at exactly 3:03:03 p.m. To the nearest second, exactly what was the plane's travel time?

15

If there are 16 telephone poles in a straight line, each pole 80 meters apart, how far is it from the first pole to the last?

10

How many prime numbers are there between 50 and 100?

12

Can you describe in words the set of all numbers, if any, that are larger than their squares?

5

Last year a dinner cost $32 and a bottle of wine cost $18. This year the cost of the dinner increased by 5% and the cost of the wine increased by 10%. What was the percent increase in the combined cost of the dinner and wine?

5

A nine-meter long piece of wood is cut so that one piece is 50% longer than the other. Exactly how long is the longer piece?

10

If 5 workers can pack 5 boxes of flowers in 5 minutes, at the same rate, how many boxes can 10 workers pack in 10 minutes?

4

If a sports team has won 30 games and lost 20 so far this season, what percentage of their remaining 20 games must they win in order to have a 50% winning season?