There are 30 students in a class.13 students like football;18 students like volleyball and 7 students don't like anything.How many students like both?

There 30 students in a class. 16 students have ruler; 12 students have erasers and 8 students have nothing. How many students have both at least?

Class 4A has 45 students, class 4B has 42 students. How many students are there in whole classes

-> There are .............. students

Class 4A has 32 students, class 4B has 36 students. How many students are there in whole classes

A shool has 24 classes and there are 40 students in each class. 1/8 of the students wear glasses and 1/12 of those who wear glasses are boys. How many schoolgirls wear glasses in the schoool?

help me!

Nam My primary school has 398 boys and 325 girls .

How many students are there in Nam My primary school .

Answer : There are ..............................students in Nam My primary school . 

there are 9 more boys than girls in a class . There are 37 students in all . how many girls are there in the class ? 

in a class A of 160 students, the ratio of boys to girls is 3 to 5.in the class B, the ratio of boys to girls is 3 to 2. when the to classes are combined, the ratio of boy to girls is 1 to 1. how many students are there in the class B