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- Question
Three circles of radius 3.5cm are placed in such a way that each circle touches the other two. The area of the portion enclosed by the circles is
Options- A. 1.967
- B. 1.867
- C. 1.767
- D. 1.567
- Correct Answer
- 1.967
Explanationrequired area = (area of an equilateral triangle of side 7 cm)- (3 * area of sector with à = 60 degrees and r = 3.5cm)
sq cm= sq cm
= 1.967 sq cm
- 1. The average age of 5 sisters is 20 yr. If the age of the youngest sister be 4yr. What was the average age of the group of sister at the birth of the yongest sisiter?
Options- A. 25 yr
- B. 15 yr
- C. 18 yr
- D. 20 yr Discuss
- 2. Find the income by investing $ 81000 in 9% stock at 135.
Options- A. $ 5500
- B. $ 6400
- C. $ 5400
- D. $ 6000 Discuss
- 3. 11, 13, 17, 19, 23, 29, 31, 37, 41, (....)
Options- A. 43
- B. 47
- C. 53
- D. 51 Discuss
- 4. 3, 5, 9, 11, 14, 17, 21?
Options- A. 21
- B. 17
- C. 14
- D. 9 Discuss
- 5. 22, 33, 66, 99, 121, 279, 594?
Options- A. 33
- B. 121
- C. 279
- D. 594 Discuss
- 6. What is the average of four tenths and five thousandths
Options- A. 25002
- B. 2502
- C. 0.2025
- D. none Discuss
- 7. Which number will come in place of question mark 7, 16, 36, 78, 144, ?
Options- A. 168
- B. 196
- C. 222
- D. 256 Discuss
- 8. Seven years ago, the average age of A, B and C was 51 years. If A is 3 years older than B and B is 3 years older then C then the present ages of A, B and C are ( in year)
Options- A. 61, 58 and 55
- B. 54, 51, and 48
- C. 55, 58, and 61
- D. 48, 51 and 54 Discuss
- 9. In the given figure, PQRS is a square inscribed in a circle of radius 4 cm. PQ is produced till point Y. From Y a tangent is drawn to the circle at point R. What is the length (in cm) of SY ?
Options- A. 4√10
- B. 2√10
- C. 6√10
- D. 3√5 Discuss
- 10. If V = 12R / (r + R) , then R =
Options- A. Vr / (12 - V)
- B. Vr + (V /12 )
- C. V
- D. V / (r - 12 ) Discuss
More questions
Correct Answer: 20 yr
Explanation:
Total age of 5 sister = 20 x 5 = 100 yr.
4 yr ago, total sum of ages
= 100 - ( 5 x 4) = 100 - 20 = 80 yr
But at that time (4 yr ago), there were 4 sister in the group.
? Average age at that time(4 yr ago) = 80/4 = 20 yr.
Correct Answer: $ 5400
Explanation:
Correct Answer: 43
Explanation:
Correct Answer: 14
Explanation:
Each of the number except 14, is an odd number .
Correct Answer: 279
Explanation:
Each number except 279 is a multiple of 11.
Correct Answer: 0.2025
Explanation:
Four tenths = 0.4
Five thousandths = 0.005
The average is (0.4 + 0.005)/2 = 0.2025
Correct Answer: 222
Correct Answer: 61, 58 and 55
Correct Answer: 4√10
Correct Answer: Vr / (12 - V)
Explanation:
We have to rearrange the equation to make R the subject.
Start by cross multiplying by (r + R); V (r + R) = 12R
Multiply out the bracket Vr + VR = 12R
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