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What is the ratio of boys to girls in a class room of 30 student where the boys are 12?
In a class of 30, if there are 12 boys then there must be 18 girls. This would make the ratio: 18:12 or 3:2 (girls:boys)
If Ratios the ratio of girls to boys in a room is 1 9 if there are 4 girls How many boys should there be?
Ok, if there is one girl to every nine boys, there are 10 kids in all. that means that if there are 2 girls, you have to double 9, making 18, adding up to 20. . so, 2 girls and 18 boys. If there are 4 girls, then multiply 9 times 4. 4x1 and 4x9. and then you get your answer.
Is a room number an interval ratio?
No.
How many students must be in a room to be sure that at least nine are boys or at least nine are girls?
Assuming that any given student must be either a boy or a girl (that is, no student can be neither a boy nor a girl), then 17 is sufficient. With sixteen students, you could have 8 boys and 8 girls, so there wouldn't be nine of either; adding the seventeenth student will push one or the other group to nine.
How do you divide 36 boys in 9 room in odd order?
Put none in the first room, then 1 in the second, 2 in the third, 3 in the fourth... and so on until there are 8 in the ninth room. Room boys total # 0 ...... 0 # 1 ...... 1 # 2 ...... 3 # 3 ...... 6 # 4 .... 10 # 5 .... 15 # 6 .... 21 # 7 .... 28 # 8 .... 36
