SAT SUBJECT TEST MATH LEVEL 1
ALGEBRA
CHAPTER 7
Word Problems
AGE PROBLEMS
In age problems, it often helps to organize the given data in a table.
EXAMPLE 3: In 2001, Lior was four times as old as Ezra, and in 2003, Lior was twice as old as Ezra. How many years older than Ezra is Lior?
Let x represent Ezra’s age in 2001, and make the following table:
Year |
Ezra |
Lior |
||
2001 |
x |
4x |
||
2003 |
x + 2 |
4x + 2 |
In 2003, Lior was twice as old as Ezra, so
So in 2001, Ezra was 1 and Lior was 4. Lior is 3 years older than Ezra.