Quantitative Aptitude Mock Test 8

A group of students is made up of boys and girls in the ratio 5:4. If there are 15 boys in the group, how many girls are there?

A mixture of alcohol and water is in the ratio 3:2. If there are 10 liters of alcohol in the mixture, how many liters of water are there?

A bag contains red, blue, and green marbles in the ratio 2:3:4. If there are 12 red marbles, how many marbles are there in the bag?

If a train travels 240 km in 4 hours, what is the average speed of the train in km/h?

A man earns Rs. 12000 per month. He spends 60% of his income on rent and food, 20% of his income on travel and other expenses, and saves the rest. How much money does he save each month?

A train travels 100 km in 2 hours. If the speed of the train is increased by 20%, what is the new time taken to travel the same distance?