Michael has a jar with 24 coins. three eighths of the coins are U.S. coins. The rest of the coins are foreign coins. Michael adds 12 U.S. coins to the jar.
a. What fraction of the coins in the jar are foreign coins now?
Michael continues to add U.S. coins to the jar.
b. How many more U.S. coins must Michael add to the jar so that one eighth of the coins are foreign coins?