Whats 5 + 10 +10+1010+

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,