Wipro Company Numerical Ability Percentage

A man spends 70% of his salary on food expenses, 40% of the rest on traveling expenses, 90% of the rest on house rent and was finally left with $3600. How much did he spend on traveling expenses?
A. 24000
B. 18000
C. 25000
D. 22000
E. 20000

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Wipro Other Question
The ratio of two numbers is 5:6. If a number is added to both the numbers the ratio becomes 7:8. If the larger number exceeds the smaller number by 10. Find the number added.
A. 30
B. 10
C. 20
D. 40
E. Cannot be determined A certain amount of solution contains 18% alcohol. 8 litres of the solution is taken out and replaced with water. The resultant solution contains 15% alcohol. Find the volume(in litres) of the solution
A. 40
B. 50
C. 48
D. 44
E. None of these