A. 30m
B. 40m
C. 50m
D. 60m
✅ The correct answer is option C. 50m.
The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is_____________?
A. 11.0
B. 11.3
C. 11.4
D. 11.5
✅ The correct answer is option D. 11.5.
Updated by: Ali Asghar
Updated by: Ali Asghar
283. In what ratio should the profit of Rs.8000 be divided if X starts a business with an investment of Rs. 20000, Y invests Rs.7500 for 4 months and Z invests Rs.15000 after 3 months from the start of the business.
A. 16 : 2 : 3
B. 8 : 3 : 6
C. 16 : 2 : 9
D. 6 : 9 : 1
✅ The correct answer is option C. 16 : 2 : 9.
Let the profit of X be P1, that of Y be P2 and of Z be P3.
Let the profit of X be P1, that of Y be P2 and of Z be P3.
P1:P2:P3 = 20000*12 : 7500*4 : 15000*9 = 240 : 30 : 135 = 80 : 10 : 45
= 16 : 2 : 9
281. Three towns X, Y, and Z are on a river which flows uniformly. Y is equidistant from X and Z. If a boats man rows from X to Y and back in 10 hours and X to Z in 4 hours, find the ratio of speed of the boats man in still water to the speed of the current.
A. 2:5
B. 5:3
C. 3:5
D. 1:2
✅ The correct answer is option B. 5:3.
X ———— Y ———— Z
X ———— Y ———— Z
If ‘d’ is the distance between X and Y, then ‘d’ is the distance between Y and Z.
Now the total time for the batsman to row from X to Z is 4 hours. Therefore, time to row from X to Y is 2 hours.
Also the time for the boats man to row from X to Y and back is 10 hours. Hence, time required to row from Y to X is 8 hours.
If, a: speed of boats man in still water
b: speed of the river
d/(a + b) = 2; d/(a – b) = 8
2*(a + b) = 8*(a – b)
a + b = 4a – 4b
3a = 5b
a:b = 5:3
A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 at a credit of 1 year. If the rate of interest is 10% per annum, the man:
A. gains Rs. 55
B. gains Rs. 50
C. loses Rs. 30
D. gains Rs. 30
✅ The correct answer is option B. gains Rs. 50.
The average age of 8 men increases by 2 years when two women are included in place of two men of ages 20 and 24 years. Find the average age of the women?
A. 36 years
B. 24 years
C. 30 years
D. 18 years
✅ The correct answer is option C. 30 years.
20 + 24 + 8 * 2 = 60/2 = 30
20 + 24 + 8 * 2 = 60/2 = 30
The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is_________?
A. 6 kmph
B. 7 kmph
C. 8.5 kmph
D. 8 kmph
✅ The correct answer is option A. 6 kmph.
If the simple interest on a certain sum of money after 3 1⁄8 years is 1⁄4 of the principal, what is the rate of interest per annum?
A. 6%
B. 4%
C. 8%
D. 12%
✅ The correct answer is option C. 8%.
270. (0.456 * 0.456 – 0.228 * 0.228) / (0.456 + 0.228) = ________?
A. 0.228
B. 0.456
C. 0.684
D. 1.0
✅ The correct answer is option A. 0.228.
267. The diameters of two spheres are in the ratio 1:2 what is the ratio of their surface area?
A. 1:2
B. 1:4
C. 2:1
D. 4:1
✅ The correct answer is option B. 1:4.