Fill in each blank with the correct word or number

Fill in each blank with the correct word or number. There is one example.

0) Fill in the blank with ONLY ONE WORD.

Ten plus five equals fifteen.

1) Fill in the blank with ONLY ONE WORD.

In the expression <!--[if gte msEquation 12]>270 – a : b<!--[endif]--> , <!--[if gte msEquation 12]-->a<!--[endif]-->  is a letter

2) Fill in the blank with ONLY ONE NUMBER.

Given expression <!--[if gte msEquation 12]>36 : c – d<!--[endif]--> . When <!--[if gte msEquation 12]-->c = 4<!--[endif]-->  and <!--[if gte msEquation 12]-->d = 6<!--[endif]--> , the value of the expression is 3

3) Fill in the blank with ONLY ONE WORD. 

The number of students in school A is sixty-three thousand. The number of students in school B is eighty-nine thousand. To find how many more students are in school B than in school A, we take the number of students in school B twenty-five thousand the number of students in school A, which is twenty-six thousand.