ratio prob?

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Hello, Anyone expert help me to solve if poss, step by step as ususal: 1) In a class of 60 students, 12 are group leaders. Find the ratio of students who are group leaders to the total number of students in the class as a) a fraction in lowest terms b) a decimal 2)In a box of red & green balss, the ratio of red balls to the green balls is 6:7. Find the number of the red balls if the box has a)49 green balls b)182 balls in all 3)The table below shows the number of servings as compared to the amount being served. AMOUNT NUMBER OF SERVINGS 2 POUNDS 6 4 POUNDS 12 6 POUNDS 18 a)Is the number of servings directly proportional to the amount being served?Why? b)How many servings would 50 pounds provide? c)How many pounds would 60 servings need? 4) 4 women can clean the school in 5 days a) How many days are needed for 5 women to finish cleaning the same school? b)How many women are needed if the school needs to be cleaned in 2 days? many txs in advance:-)