The populations of termites and spiders in the certain house are increasing exponentially. House contains 100 termites the day you move in. After 4 days, house has 95 termites. Three days after moving in, there are 2 times as many termites as spiders. 8 days after moving in, there were 4times as many termites as spiders. How long (in days) it takes population of spiders to triple?