SSS - the side they're sharing is also congruent so if you just add in the other congruent sides you get SSS
Answer:
B
Step-by-step explanation:
6 oz, 19lb
1 lb, 20lb
2 oz, 20lb 2oz
6oz+2oz+1lb= 1lb 8oz
A proportion looks like this:

It means that the quantity a,b,c and d are in the same proportion: the ratio between a and b is the same ratio between c and d.
They are particularly useful in situation when you have an example given, and you want to extrapolate the relationship for another couple.
For example, you can think of the following problem: "Five apples cost 2 dollars. How much will 8 apples cost?"
You can build the proportion

And then solve it for x:

1/125 in a decimal is 0.008.
Is either I’m blind and can’t see or the letter are way too small