Write two fractions whose quotient is 28/45?

  (7/9) ÷ (5/4) = 28/45

Step-by-step explanation:

Fractions can be divided by using the rule "invert and multiply". We can look at the factors of 28 and 45 to see what might have been multiplied to get these numbers.

  28 = 1·28 = 2·14 = 4·7

  45 = 1·45 = 3·15 = 5·9

So, there are a number of possibilities. A couple of them are ...

  28/45 = (7/9) × (4/5) = (4/9) × (7/5)

If we choose to use the first of these pairs of fractions, we can invert one of the fractions to make the denominator, then write the quotient as either of ...

 (7/9) ÷ (5/4)

or

  (4/5) ÷ (9/7)

Okay so this is simple addition, once you know how to do it. 
The interior angles of a triangle should always add up to 180 Degrees. 

Now that you know this, all you have to do is add the numbers together and see which ones add up to 180 degrees. 

A. - 90+42+58=190
B. - 60+60+60=180
C. - 100+48+42=190
D. - 31+75+70=176

Out of these choices the only one that adds up to 180 is B. So your answer would be B.