18 tens 20 ones equals

In this question, you are given multiple number names and asked to add it. To answer this question it would be easier to split the description into a different part like this:

1. "18 tens" mean 18 * 10 = 180

2. "20 ones" mean 20 * 1 = 20

If you add them, then you will got : 180+20 = 200