Roger is looking at a map where the scale is 2km =4.5cm. If he measures the distance from his house to the center of town on the map as 12.6cm, how many kilometers is the distance from the center? (A) 2.8 (B)5.6 (C) 6 (D) 7.6
Tom takes 20 coins from a box, and he gets 12 red coins and 8 black coins. If the whole box contains 10000 coins, about how many of them are black? (A)8000 (B)4000 (C)400 (D)6000
