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Need help with math riddles please!?
Thanks in advance for your help. These are some math riddles I need to do for Algebra class. I've attemped all of these, but I can't figure them out :(
1. Five years ago, I planted a four-foot-tall tree in my front yard. It has grown the same amount each year, and last year it was twice as tall as it was at the end the first year. How tall is the tree now?
2. How long will it take a mile-long train going 20 mph to get completely through a 2-mile long tunnel?
3. Borox is loading a freight elevator with 12 boxes: 4 small, 5 medium, and 3 large. A small box and a medium box together weigh 20 pounds. A medium and large box together weigh 24 pounds. What is the total weight of the 12 boxes?
4. What is the maximum number of point of intersection when two circles and five straight lines intersect each other.
5. Construct an eight-digit number using the digits 1,1,2,2,3,3,4,and 4 arranged so that the 1's are separated bu one digit, the 2's are separated two digits, and the 3's are seperated by three digits, and the fours are seperated by four digits.
6. Two candles of equal length are lighted at noon. One candle takes 9 hours to burn out, and the other takes 6 hours to burn out. At what time will the slower-burning candle be exactly twice as long as the faster-burning one?
7. The perimeter of digits in one square is 36 inches more than the perimeter of a second square, and the are of the first square is 243 square inches more than the area of the second square. Find the area of each square.
8. Arrange the four numbers 2,3,4,and 5 along with one plus (+) sign and one equals (=) sign, into a true mathematical equation.
If you help me with any of these that would be great. Thank you!!!
10 Answers
- 1 decade agoFavorite Answer
1. 14 feet If you read carefully it says at the end of the first year so its already grown for a year. Assuming it grew 2 feet a year at the end of the first year it would be 6 feet tall. Three years later (the end of the 4th year) it would be 12 feet tall, 1 year later it would be 14 feet tall.
2. 9 minutes Think of 20 mph as 1/3 of a mile a minute. The train is a mile long, the tunnel is 2 miles long so the train will have to go a mile after its engine has left the tunnel before its end is out of the tunnel, 3 miles. The train is moving at 1 mile every 3 minutes, 9 minutes.
3. 130 pounds Assuming that the boxes are filled with the same things so that the large box will always be heavier than the medium box and the medium box will always be heavier than the small box the only weights that would equal the totals said above would make small=9lbs medium=11lbs and large=13lbs. Add em all up and you've got 130 lbs
4. 6 purely a guess, two lines going horizontally through the circle the other 3 going vertically to intersect 6 times.
5. 41312432 nuff said
6. 4.30pm making use of the LCD, assume each candle is 18 inches. the slower burning candle will burn 2 inches an hour and the faster burning candle will burn at 3 inches an hour, at 4:30 the slower will be at 9 and the faster will be at 4.5
7. ?
8. Not possible with only one (+) and one (=) sure you copied that one down right?
Source(s): My brain, bored at work. - 1 decade ago
1. 9 foot
2. 12 minutes
3. 130 pounds
4. ?
5. 41312432
6. 4.30pm
7. 81 square inches, 324 square inches
8. 5+2 = 4+3
- 1 decade ago
I used to answer mathematics quizzes. It just bring back memories. I'll try with some that I am familiar with...
No. 1: It grows 2 foot a year, after first year it was 6 foot, after 4 years it was 12 foot. Its now 14 foot
No. 5: 41312432
- 1 decade ago
1.28 feet; 4*5=20 ft. last yr. 2*4=8
2.2; the train is a mile-long and the tunnel is 2; it'll take 2 times
3.???
My brain's hurting...get bac witcha l8r
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- Anonymous1 decade ago
wait...isn't the first one just the same because it says it has grown the SAME amount EACH year? or is that just me? xD
