 ### math & puzzles Online Quiz - 7

 Description: math & puzzles Online Quiz - 7 Number of Questions: 20 Created by: Aliensbrain Bot Tags: math & puzzles
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cos0*cos1*cos2*cos3*......cos99? what is the value?0,1,2... all are in degree

1. 90

2. 1

3. 0

4. none of these

Correct Option: C

(a+b+c)^2

1. (a^2+b^2+c^2)

2. (a^2+b^2+c^2+ab+bc+ca)

3. all of these

4. (a^2+b^2+c^2+2ab+2bc+2ca)

Correct Option: C

a^3+b^3+c^3-3abc =?

1. (a+b+c)(a^2+b^2+c^2-ab-bc-ca)

2. (a^2+b^2+c^2-ab-bc-ca)

3. (a^2+b^2+c^2+ab+bc+ca)

4. none of these

Correct Option: A

1^2+2^2+3^2=?

1. n(n+1)/2

2. n(n+1)(2n+1)/6

3. [n(n+1)]^2

4. all of the above

Correct Option: B

0,1,3,6,?,15

1. 10

2. 11

3. 12

4. 13

Correct Option: A

2,6,12,?,30

1. 21

2. 20

3. 22

4. 23

Correct Option: B

1,2,9,64,625,?

1. 189

2. 625

3. 7776

4. 149

Correct Option: C

5,52,521,526,?

1. 5210

2. 5213

3. 5215

4. 5218

Correct Option: B

2,5,10,17,?

1. 29

2. 30

3. 26

4. 38

Correct Option: C

A 34" x 34" square metal plate needs to be fixed by a carpenter on to a wooden board. The carpenter uses nails all along the edges of the square such that there are 35 nails on each side of the square. Each nail is at the same distance from the neighboring nails. How many nails does the carpenter use?

1. 136

2. 133

3. 132

4. 130

Correct Option: A

There is a number that is 3 times the sum of its digits. What is this number?

1. 24

2. 27

3. 36

4. 42

Correct Option: B

A painting job can be completed by 5 painters in 13 days. If 5 more painters join the team 3 days after starting work on the job, then how many more days are required to complete the job?

1. 2

2. 4

3. 5

4. 3

Correct Option: C

Bodo weighs 100 pounds more than his sister Barbara. Their combined weight is 120 pounds. How many pounds does Bodo weigh?

1. 100

2. 10

3. 20

4. 110

Correct Option: D

Glenn and Jason each have a collection of tennis balls. Glenn said that if Jason would give him 9 of his balls they would have an equal number; but, if Glenn would give Jason 9 of his balls, Jason would have 4 times as many balls as Glenn. How many balls does Jason have?

1. 37

2. 38

3. 39

4. 40

Correct Option: C

A pillar 16 feet tall casts a shadow 4 feet long on the ground. If the pillar was 20 feet tall, how many feet in length would the shadow be ?

1. 2

2. 3

3. 4

4. 5

Correct Option: D

Mr. Brown has 8 black gloves and 6 brown gloves in his closet. He blindly picks up some gloves from the closet. What is the minimum number of gloves Mr. Brown will have to pick to be certain to find a pair of gloves of the same color?

1. 1

2. 4

3. 2

4. 3

Correct Option: D

Man Wrinkle spent one-fourth of his life as a boy, one-eighth as a youth, and one-half as an active man. If Man Wrinkle spent 10 years as an old man, then how many years did he spend as an active man?

1. 20

2. 60

3. 40

4. 80

Correct Option: C

It was Kathleen's first day at school. The teacher said, "When you meet, please shake hands and introduce yourself by name."If there were 14 children in the class, how many total handshakes were there?

1. 90

2. 91

3. 92

4. 93

Correct Option: B

A tennis championship is played on a knock-out basis, i.e., a player is out of the tournament when he loses a match.How many players participate in the tournament if 63 matches are totally played?

1. 64

2. 63

3. 65

4. 62

Correct Option: A

Identify the figure that completes the pattern.

1. 1

2. 2

3. 3

4. 4

Correct Option: D
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