1. If there were 1,500,231,206 hydrogen atoms in a collection of H2 O molecules,how many oxygen atoms were there?
2.Luis has his little brother convinced that he is a genius. He asks his little brother to write down a three digit number on a piece of paper and then show it to him for 5 seconds. After 5 seconds are up, Luis tells his brother if the number is divisible by 3 and 5,and he is right every time. How does he do it?
2.Luis has his little brother convinced that he is a genius. He asks his little brother to write down a three digit number on a piece of paper and then show it to him for 5 seconds. After 5 seconds are up, Luis tells his brother if the number is divisible by 3 and 5,and he is right every time. How does he do it?