I'm stuck on this math problem: Mr Cruz went to his doctor to seek advice on the best way to gain weight. His doctor told him to include more proteins in his meals and live a generally healthy lifestyle. After a month of following his doctor's advice, Mr Cruz had a weight gain of 20 pounds. He gained 30 more pounds in the second month after more healthy eating habits. If he originally weighed 70 pounds, what's his weight after the two months?
Can you help?