Iam a number between 20 and 30. when you divide me into 6 equal groups, there is an even number in each group and 2 are left over. what number am i?

Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment