There were 18 girls and 15 boys on the track team.
7 more girls joined the team.
4 boys quit the team.
How many children were on the track team then?

London is 11 years old and Blair is 16 years old.
Several years ago, Blair was twice as old as London.
How old was London then?
(Hint: Make a chart.)

Anna has a total of 28 nickels and dimes in her piggy bank.
She has 8 fewer nickels than dimes.
How many dimes does Anna have?

Cindy and Dan have the same number of stickers.
Cindy used 15 of her stickers.
Dan bought 18 more stickers.
How many more stickers did Dan have than Cindy then?

Rick and Todd have the same number of candy bars.
Rick ate 11 candy bars.
Todd gave away 18 of his candy bars.
How many more candy bars did Rick have than Todd then?