.......20 boys and 13 girls on my class.

A.There are

B.There is 

C. Are there

There are 1400 students in a school.The number of girls is 3/4 the number of boys. How many students are in other levels if 1/6 of the girls and 1/5 of the boys are in Primary One

I. Rewrite the following sentences

1.My friend walks to school at 6:30 am

-Does ...................................................

2.There are many flowers in our school

-Our school ...........................................

3.My class has 12 boys and 8 girls

-There.............................................

4.Is there a TV in her room ?

-Does ...................................

5. It is a school bag. The bag is big

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

Linda's class has 36 students.The number of the girls is twice the number of the boys.How many boys are there?

1. A school choir has 72 members altogether. The number of the girls is 6 more than the number of the boys. How many girls are there in the school choir?

The sum of the ages of three boys is equal to the sum of the ages of three girls, and the product of the boys’ ages is equal to the product of the girls’ ages, too. All six children are of different ages, and all are under 20. Suppose that their ages are integers, and the age of the second oldest boy is 14, what is the age of the second oldest girl?