Quantitative Aptitude Mock Test 10

The ratio of the number of boys to the number of girls in a class is 2:1. If the number of students in the class is increased by 10, and the ratio of the number of boys to the number of girls remains the same, then what is the new number of boys in the class?

The ratio of A's salary to B's salary is 2:3. The ratio of B's salary to C's salary is 4:5. If A's salary is increased by 10%, and B's salary is increased by 5%, then what is the new ratio of A's salary to B's salary to C's salary?

If the ratio of A's speed to B's speed is 3:2, and the ratio of B's speed to C's speed is 5:4, then what is the ratio of A's speed to C's speed?

A mixture of milk and water is in the ratio 3:2. If 1 liter of milk is added to the mixture, the ratio of milk to water becomes 5:1. How many liters of water were in the original mixture?

A train travels 100 km in 2 hours. If the speed of the train is increased by 20%, what is the new distance traveled by the train in 2 hours?