Answer the following with complete solutions:

1. The ratio of two numbers is 6:7. If the larger number is 42, what is the smaller one? a) 18 b) 7 c) 6 d) 42 e) 36 2. In a bag of marbles, the ratio of the number of green marbles to the number of blue marbles is 4 to 5. If there are 48 green marbles, how many blue marbles are in the bag? a) 5 b) 15 C) 60 d) 75 e) 135 3. A certain factory employs 60 workers. If 4 out of every 5 workers are married, how many married workers are employed by the factory? a) 16 b) 20 C) 24 d) 40 - e) 48 4. In a class of 200 students, ratio of boys to girls is 2:3. How many girls are in the class? a) 30 b) 40 c) 60 - d) 80 e) 120 5. If the ratio of boys to girls in a classroom is 1 to 3, what percent of the class is girls? a) 10% b) 25% c) 33-% d) 50% e) 75%6. A paint mixture contains yellow, blue and red in a 3:2:1 ratio, respectively. If the mixture contains twelve pints of yellow paint, how many pints are there altogether? a) 9 b) 12 c) 15 d) 16 -e) 24 7. Oil is poured into a large, empty tank at the rate of 500 gallons per minute. At the same time, oil is leaking out at a rate of 300 gallons per minute. If it takes 1 hour to fill, how many gallons of oil can the tank hold? a) 5,000 b) 6,000 c) 9,000 d) 12,000 e) 15,000