this is a simple question about reducing ratios - but also reducing problems. My first step here would be to get rid of the fluff.
We don't care here about what a tablespoon or cup actually is, we just care about the table. So my first step would be to translate this problem into something like this:
Based on the table below, what is the relationship between X and Y?
X Y
4 64
5 80
6 96
7 112
There's a reason it may be important to do this; if you are familiar with tablespoons and cups already, you know that there are many more tablespoons in a cup than the other way round. This can confuse you and ultimately has you focusing on not the math, which is the wrong thing to do.
Now that we have a more straightforward thing to work with, take the first set of X/Y values...
4 / 64
...and divide both by the smaller number...
4/4 = 1
64/4 = 16
...so we get....
4 / 64 = 1 / 16
...so far, so good. we need to be sure though, so let's check that against the other numbers in the table, by multiplying our X by 16 so we can see if it matches our Y. Here's the formula...
16x = 1y
...so...
16 (5) = 80
..that checks out. Try the rest on your own.