Mr and Mrs Brown
When Mr and Mrs Brown married, the sum of their ages was 44.
The difference between their ages was one-sixth of the sum of their ages 10 years before their marriage.
How old were Mr and Mrs Brown when they married?
EIGHTS AND NINES
The integers from 1 to 9 are listed on a blackboard.
The mean of all the numbers in the list is 5.
Some extra eights and nines are added to the list.
The mean of all the numbers on the list is now 7.3.
How many eights and nines are added to the list?