15% of the town's population is over the age of 65. If there are 450 residents over the age of 65, what is the town's total population?

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?