Sales of Smartwatches: Model X vs. Model Y

A company sells two types of smartwatches: Model X and Model Y. The company sells Model X for $200 each and Model Y for $150 each. In one month, the company sold a total of 1,200 smartwatches, generating $210,000 in revenue. If the number of Model X watches sold was twice that of Model Y watches sold, how many Model X watches did the company sell?