Teddy is preparing to sell some wooden blocks at a garage sale. Before pricing individual bags of blocks, he decides to determine the approximate number of blocks per pound by researching the weights of different sets of blocks. The graph shows his data. A graph shows weight of set (pounds) labeled 0.5 to 5 on the horizontal axis and number of blocks on the vertical axis. A line increases from 0 to 5.5. About how many blocks are there per pound? Round to the nearest block. 10 20 30 40