Wipro Company Numerical Ability Ratio and Proportion

Four brothers Adam, Bill, Charles and David together contributed certain amount of money and purchased a car. The contribution made by Adam is half that of the total contribution made by the other three brothers, contribution made by Bill is one-fourth of the total contribution made by the other three brothers and the contribution made by Charles is two-third of the total contribution made by the other three brothers. If the total price of the car is $9900, find the contribution made by David.
A. $540
B. $580
C. $600
D. $660
E. $680

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Wipro Other Question
The monthly traveling expenses of John are partly constant and partly vary with the number of miles that he travels in a month. When he travels 150 miles the total traveling expenses are $800 and when he travels 180 miles the total traveling expenses are $900. Find the total monthly expenses in a certain month in which he traveled 300 miles.
A. $1650
B. $1600
C. $1450
D. $1300
E. $1400 The ratio of the ages of A and B is 9:5. After 8 years B would reach the present age of A. Find the present ages of B and A respectively.
A. 9, 5
B. 10, 18
C. 18, 10
D. 5, 9
E. 5, 7