In an ice-cream shop there was some money in a drawer. After selling 6 ice cream cones, there are 70 dollars in the drawer. After selling a total of 16 ice cream cones, there are 120 dollars in the drawer. How many dollars were there in the drawer at the start? (2021 Math Kangaroo Problem, Level 3-4, Question \#13) 
选项为:A:$$20$$  B:$$30$$  C:$$40$$  D:$$50$$  E:$$60$$  请回答其中一个选项.