Dan's skateboarding helmet has ten more craters than Daniel's ski helmet. Rin's snorkel helmet has 15 more craters than Dan's and Daniel's helmets combined. If Rin's helmet has 75 craters, how many craters are in Dan's helmet?
If Rin's snorkel helmet has 75 craters, then Dan's and Daniel's helmets combined have 75-15 = <<75-15=60>>60 craters.
Let's assume Dan's helmet has C craters.
Since Dan's skateboarding helmet has ten more craters than Daniel's ski helmet, the total number of craters their helmets have is C+(C-10)=60
2C=60+10
The total number of craters that Dan's helmet has is C=70/2
Dan's skateboarding helmet has 35 craters.
#### 35