LET'S TRY MATHS QUIZ 2 (ONE FOR THE TEACHERS)

[smac]

12. 42 (quick guess).

[Kahuna]

12/ 59

[Dissident]

12 is 45.
(25 + 10 -7 for all the people who like at least one, + 17 for those that like neither)

[magpie in the 80's]

12. 45

correct professor

[magpie in the 80's]

12. 42 (quick guess).

quick answer............WRONG

[magpie in the 80's]

12/ 59

incorrect

[magpie in the 80's]

12 is 45.
(25 + 10 -7 for all the people who like at least one, + 17 for those that like neither)

correct DISS

[magpie in the 80's]

1. A kite's diagonal (AC) is 4.5 cm long. The other diagonal (BD) is 3.5 cm longer than the diagonal AC. What is the area of the kite ABCD? 18 CM^2
2. Simplify: 5x/3 * 6x/15 2/3X^2
3. A jar contains 5 blue marbles, 8 red marbles, and 3 black marbles. Tom picks a marble at random from the jar and then John draws at random another marble from the jar. What is the probability that Tom draws a red marble and John draws a blue one? 1/6
4. What will be the diameter of a circle with circumference 12 inches? 3.82 INCHES
5. Tom scores 4.5 out of 5 in a maths test. What is his percentage mark? 90%
6. A radio is bought for $16 and sold for $18. What is the percentage profit? 12.5%
7. What do you call two angles on a straight line that add up to 180 degrees? SUPPLEMENTRY
8. The angles of a triangle have the ratio 5:7:6. What is the product of the smallest and largest angle? 3500
9. A rectangular box measures 30 cm by 20 cm by 18 cm. How many cubic centimetres of rice can be put in the box? 10800
10. Jill bought a pair of jeans for $5. She liked those jeans so she decided to buy 5 more pairs of jeans. How much does she need to earn to buy 5 more pairs of jeans? $25
11. An angle measuring 60 degrees is measured as 62 degrees. What is the percentage error correct to 3 significant figures? 3.33%
12. In a group of x children, 10 like Maths and 25 like English. 7 like both subjects and 17 like neither. How many children are there in the group? (Hint: If 10 children like Maths, this does not mean ONLY 10 children like Maths.) 45
13. A box contains 20 fresh fruits: some mangoes and some grapes. If there are 8 more mangoes than grapes, how many mangoes are there? 14 MANGOES / 6 GRAPES
14. A card is drawn at random from an ordinary pack of playing cards. What is the probability that it is neither a face card nor a black card? 5/13
15. What is the value of 64^(2/3)? 16
16. The area of a face of a cube is 81 cm^2. What is the volume of the cube in cubic centimeters? 729CM^3
17. What is the supplement of ([dozen sixes] + 80)degrees? 28 DEGREES
18. A man needs to sell a cuckoo-clock originally costing $300 to make an exact profit of 10%. How much should he sell it for? $330
19. If 5/8 of the children in a school are boys and the school consists of 2400 students, how many girls are there? 900
20. Jack's average mark after 8 results was 54. This dropped to 49 when he received his ninth result which was for Maths. What was his Maths mark?9

END OF QUIZ

[smac]

12. 42 (quick guess).

quick answer............WRONG

[Kahuna]

END OF QUIZ

What about the extra question?

[magpie in the 80's]

END OF QUIZ

What about the extra question?

that's a personal Q which i will try to get to

[magpie in the 80's]

Magpie you have all the answers so here is a question for you (Kahuna's Maths Quiz 2).........
Q1. Assume the Earth is a perfect sphere 20,000km in circumference and you have a piece of string that is exactly 20,000km in length. How much more string do you need to circle the Earth 1 metre above the surface?

3 SOMETHING

[smac]

Magpie you have all the answers so here is a question for you (Kahuna's Maths Quiz 2).........
Q1. Assume the Earth is a perfect sphere 20,000km in circumference and you have a piece of string that is exactly 20,000km in length. How much more string do you need to circle the Earth 1 metre above the surface?

Code: Select all

Diameter      = circumference/pi
              = 20,000/3.14159
              = 6,366.203

Diameter of 'new circle', 1 metre extra on each side would be:
              = 6,368.203
Circumference = diameter * pi
              = 6,368.203 * 3.14159
              = 20,006.28

You would need 6.28 extra kilometres of string.

[Professor]

smac
you need 6.28 metres extra, not kilometres :

[magpie in the 80's]

smac
you need 6.28 metres extra, not kilometres :

forgot to add the other side

[smac]

smac
you need 6.28 metres extra, not kilometres :

Sure about that professor? The original length was in KMs, all 20,000 of them. An extra 6.28 of them would also be KMs, would they not?

[smac]

smac
you need 6.28 metres extra, not kilometres :

forgot to add the other side

Nope, I didn't forget to do that at all.

[Kahuna]

Well done smac!
Simpler way to solve this-- Circumference = pi x diameter
Diameter has increased by 2m therefore circumference increased by pi x 2.
3.14 x 2 = 6.28.
This will work no matter what the size of the given sphere/circle.

To steal Magpie's thunder, END OF QUIZ.

[smac]

Well done smac!
Simpler way to solve this-- Circumference = pi x diameter
Diameter has increased by 2m therefore circumference increased by pi x 2.
3.14 x 2 = 6.28.
This will work no matter what the size of the given sphere/circle.

To steal Magpie's thunder, END OF QUIZ.

Cheers Kahuna, had to REALLY look into the recesses of my brain to recall that formula, no chance I was going to be thinking straight enough to actually simplify it!

[magpie in the 80's]

smac
you need 6.28 metres extra, not kilometres :

forgot to add the other side

Nope, I didn't forget to do that at all.

NO THATS FOR ME SMAC I HAD 3 SOMETHING
I WAS DOING THAT 3.14 PI THING BUT FORGOT THE OTHER SIDE