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Find the value of k for which the quadratic equation 2x^2 + kx + 3 = 0 has real and equal roots.
A±2*sqrt(6)
B±3*sqrt(2)
C±4
D±6
By selling a watch for Rs. 1,140, a man loses 5%. At what price should he sell it to gain 5%?
ARs. 1,200
BRs. 1,230
CRs. 1,260
DRs. 1,290
The average score of 8 numbers is 18. If one number is excluded, the average becomes 16. What is the excluded number?
A28
B30
C32
D34
A train 300 meters long passes a platform 200 meters long in 25 seconds. What is the speed of the train in km/h?
A54 km/h
B72 km/h
C80 km/h
D90 km/h
The ratio of the ages of two persons A and B is 3:4. Six years ago, the ratio was 2:3. What is B’s present age?
A18 years
B20 years
C24 years
D30 years
Find the compound interest on Rs. 12,000 for 2 years at 5% per annum compounded annually.
ARs. 1,200
BRs. 1,230
CRs. 1,250
DRs. 1,300
A can do a work in 15 days and B in 20 days. If they work together for 4 days, what fraction of the work is left?
A1/15
B7/15
C8/15
D11/15