Visa question to mainland China?

Sir, We are having China Visa (Single Entry). Is it possible that we plan our journey by return ticket from New-Delhi to Hongkong and return. Reach at Hongkong and then immediately enter to China from Hongkong. Stay China for 5 days and return to Hongkong. Then remains Hongkong and maccau for 3 days and return from Hongkong to New Delhi (India).
Please suggest that our entry from Hongkong to China and return to Hongkong is permitted on the basis of Single Entry to China.