# amphisoft technologies Interview Questions

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###### Considering Cosine rule, cos C is equal to A. 2a² + 2b² + 2c²⁄2abc B. 2a + 2b - 2c⁄2ac C. a² + b² - c²⁄2ab D. a² - b² - c²⁄2bc
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###### The ratio of the age of a man and his wife is 4 : 3 . At the time of marriage the ratio was 5 : 3 and After 4 years this ratio will become 9 : 7 . How many years ago were they married? A. 12 years B. 14 years C. 16 years D. 18 years
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###### Look at this series: 3, 4, 7, 8, 11, 12, … What number should come next? A. 10 B. 15 C. 20 D. 25
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###### Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled A. 1 hrs B. 2 hrs C. 3 hrs D. 4 hrs
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###### The angle of elevation of the top of a tower from a certain point is 30°. If the observer moves 40 m towards the tower, the angle of elevation of the top of the tower increases by 15°. The height – A. 54.7 B. 54.8 C. 54.6 D. 54.5
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###### Find the average of all even No’s up to 100 or average of first 50 even No’s. A. 51 B. 47 C. 43 D. 42
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