I is an abbreviation - taking the first and last letters of the word.
Ten billion
Those letters can be rearranged to spell "a single word".
Those letters spell billion.
十億 [shí yì]
There is no 8 letter word that can be made from the letters in "in and out". Words that can be made from those letters are:aadaidanandantataudioauditauntautodauntdindintdodondonnadonutdotdunduoIidininnintoioniotaitnationnitnonodnotnounnunnutoatonouttadtantintotoadtontunaundounionunitunto
One billion.
Two pairs of letters are there in the word ANSWER. 1) AnswE(AbcdE) - AE 2) NsweR(NopqR) - NR
"Strengths" has nine letters, but only one vowel.
1. Of or according to the clock
strengths
it is called an eon