Sean wrote a number on a piece of paper.
if he multiplied his number by 5 and then divided by 2,
the answer would be 30. what was sean’s number?

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.