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- Question
A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?
Options- A. 284⁄7 years
- B. 315⁄7 years
- C. 321⁄7 years
- D. None of these
- Correct Answer
- 315⁄7 years
ExplanationRequired average = ❨ 67 x 2 + 35 x 2 + 6 x 3 ❩ 2 + 2 + 3 = ❨ 134 + 70 + 18 ❩ 7 = 222 7 = 31 5 years. 7 - 1. Derivative of sinx by first principle?
Options- A. -sinx
- B. -cosx
- C. cosx
- D. sinx Discuss
- 2. What is the value of sin (B ? C) cos (A ? D) + sin (A ? B) cos (C ? D) + sin (C ? A) cos (B ? D)?
Options- A. 3/2
- B. ? 3
- C. 1
- D. 0 Discuss
- 3. Simplify the fraction? 5 (2/7) - 3 (1/14) - 2 (1/14) - 1 (1/7) = ? + 3 (1/17)
Options- A. -4 (1/17)
- B. 5 (2/17)
- C. -2 (1/17)
- D. 3 (3/17) Discuss
- 4. In a party there are male and female members. If 15 female quit then the number of females will become double the number of males. If 45 males quit no. of female becomes five times the number of males. Find the number of females ?
Options- A. 175
- B. 145
- C. 165
- D. 135 Discuss
- 5. Two points P and Q are at the distance of x and y (where y > x) respectively from the base of a building and on a straight line. If the angles of elevation of the top of the building from points P and Q are complementary, then what is the height of the building?
Options- A. xy
- B. ?( y/ x)
- C. ?( x/ y)
- D. ?( xy) Discuss
- 6. The average temperature of Monday to Wednesday was 37 C and of Tuesday to Thursday was 34 C. If the temperature on Thursday was 4/5 th of that of Monday, the temperature on Thursday was ?
Options- A. 35 c
- B. 36 c
- C. 34 c
- D. 32 c Discuss
- 7. 5 + 2 x 10 =
Options- A. 70
- B. 20
- C. 25
- D. 52 Discuss
- 8. If x = 7-43 then find the value of x+1x?
Options- A. 3sqrt{3}
- B. 8sqrt{3}
- C. 14
- D. 14+8sqrt{3} Discuss
- 9. Solve this inequality 3p - 16 < 20?
Options- A. p >= 12
- B. p <= 11/3
- C. p < 12
- D. p > 11/3 Discuss
- 10. 10+10(9) =
Options- A. 180
- B. 110
- C. 100
- D. 19 Discuss
More questions
Correct Answer: cosx
Correct Answer: 0
Correct Answer: -4 (1/17)
Explanation:
Given fraction is 5 (2/7) - 3 (1/14) - 2 (1/14) - 1 (1/7) = ? + 3 (1/17)
It can be written as
(5 - 3 - 2 - 1) + (2/7 - 1/14 - 1/14 - 1/7) = ? + 3 (1/17)
-1 + 0 - 3 (1/17) = ?
=> ? = -4 (1/17)
Correct Answer: 175
Explanation:
Let the number of males be 'M'
Let the number of females be 'F'
From the given conditions,
(F-15)=2M.....(i)
F=5(M-45).....(ii)
By solving the equations (1) & (2) we get M = 80
Then substitute M = 80 in (1)
F = 2M + 15
F = 2 x 80 + 15
=> F = 175
Therefore, number of males = 80 and females = 175 in the party.
Correct Answer: ?( xy)
Correct Answer: 36 c
Explanation:
Monday + Tuesday + Wednesday = 37 x 3 -----------(1)
Tuesday + Wednesday + Thursday = 34 x 3---------(2)
Thursday = 4/5 of Monday ------------------(3)
subtract eqn (1) from (2) we get,
Thursday - Monday = -9
=> Monday - Thursday = 9.......(4)
From (3) & (4), we get
So,Thursday = 36 C
Correct Answer: 25
Explanation:
According to BODMAS rule,
After multiplication only, addition is done.
Hence,
5 + 2 x 10 = 5 + 20 = 25.
Correct Answer: 14
Correct Answer: p < 12
Explanation:
The given inequality is 3p - 16 < 20
For solving this inequality, follow these steps
Now add 16 on both sides
we get 3p - 16 + 16 < 20 + 16
=> 3p < 36
Now divide the above eqn with 3 on both sides
we get, 3p/3 < 36/3
p < 12.
Correct Answer: 100
Explanation:
According to BODMAS Rule,
10 + 10(9)
= 10 + 90
= 100
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