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?

Agroup of five people go out to eat and buy appetizers and main dishes they decide to split the bill so each person pays 20% of the total cost appetizers are $5 and main dishes are $10 write an expression to show how much each person pays explain it with how to solve the problem