Three people invest in a business. The first two invest in the ratio 2:3, and the third

Question:

Three people invest in a business. The first two invest in the ratio 2:3, and the third person invests twice as much as the other two combined. The total invested is $30 million.
a. How much did the major investor contribute?
b. Does the major investor own more than half the business?
c. What fraction of the business does the major investor own?