There are 20 sandcastles on Mark's beach, each with 10 towers. On Jeff's beach, there are three times as many castles as on Mark's beach, each with 5 towers. What is the combined total number of sandcastles and towers on Mark's and Jeff's beaches?
How many towers are there at Mark's beach? ** The total number of towers at Mark's beach is 20*10 = <<20*10=200>>200 towers.
How many sandcastles and towers are there on Mark's beach? ** There are 200+20 = <<200+20=220>>220 sandcastles and towers on Mark's beach.
How many sandcastles are there on Jeff's beach? ** Jeff's beach has 3*20 = <<3*20=60>>60 sandcastles, three times as many as the number of sandcastles in Mark's beach.
How many towers are there in each of the sandcastles on Jeff's beach? ** The number of towers in each of the sandcastles on Jeff's beach is 1/2*10 = <<1/2*10=5>>5
How many towers are there on Jeff's beach? ** Since each sandcastle has 5 towers on Jeff's beach, there are 5*60 = <<5*60=300>>300 towers.
How many towers and sandcastles are there on Jeff's beach? ** In total, on Jeff's beach, there are 300+60 = <<300+60=360>>360 towers and sandcastles.
What is the combined total number of sandcastles and towers on Mark's and Jeff's beaches? ** Altogether, 360+220 = <<360+220=580>>580 sandcastles and towers can be found on their beaches.
#### 580