I know this is so stupidly simple, and I should have learned this by now. But please, help me. With this math.?

It’s not that o need help, well I do but I just don’t understand these types of problems. Here’s an example:

“For a fundraiser, Sandra raised three times as much money as Barbara , and Barbara raised $50 more than Matt. Together they raised $950. How much much money did Barbara raise?”