Question : The ratio of the number of boys to the number of girls in a class is 2 : 5. If 10 boys leave the class and 20 new girls join the class, then the new ratio of boys and girls in the class becomes 4 : 25. What is the number of boys in the class now?

Option 1: 12

Option 2: 8

Option 3: 9

Option 4: 22

Question : In a class of 60 students, the ratio of girls to boys is 2 : 3. If 20 more girls join the class, then what is the new number of girls in the class?

Option 1: 45

Option 2: 44

Option 3: 50

Option 4: 56

Question : In a class, if 55% of the students are boys and the number of girls is 90, then find the number of boys.

Option 1: 135

Option 2: 120

Option 3: 198

Option 4: 110

Question : If the ratio of boys to girls in a class is 8 : 5, which of the following options could be the total number of students in that class?

Option 1: 81

Option 2: 78

Option 3: 57

Option 4: 66

Question : In a box, the ratio of the number of green stones to black stones is 5 : 8. If there are 24 black stones, then how many total stones are in the box?

Option 1: 13

Option 2: 39

Option 3: 26

Option 4: 24