What does a equal 13/a = 39/45

15

Step-by-step explanation:

a represents 15

13/a = 39/45

We multiply 13*3 to get the denominator 39 on the right hand side.

So this means if we multiply the numerator by 3, we also multiply the denominator by 3 as well.

So, if 13*3 = 39, then what number will give us 45?

To get that number, we divide 3 into 45 to get 15

Therefore a is 15