LONDON, June 19 (Reuters) - Oil prices eased on Monday as questions over China's economy outweighed OPEC+ output cuts and the seventh straight drop in the number of oil and gas rigs operating in the United States. The oil and gas rig count, an early indicator of future output, fell by eight to 687 in the week to June 16 for the lowest total since April 2022. See here for a complete list of exchanges and delays