Sample Problems
Sample Problem #3:
Anthony’s age 5 years from now will be three more than thrice Yeng’s
age 7
years ago. On the other hand,
Yeng’s
age five years from now, will be 35
less than twice Anthony’s age 7 years ago. What are their present ages?
Solution:
To represent their ages at different points in time, it is better if we make use
of a table.
7 years ago
Present
5 years from
now
Anthony
A
–
7
A
A + 5
Yeng
Y
–
7
Y
Y + 5

Word Problems
From “Anthony’s age 5 years from now will be three more than thrice Yeng’s
age 7 years ago”
A + 5 = 3(Y
–
7) + 3
From “Yeng’s age five years from now, will be 35 less than twice Anthony’s
age 7 years ago”
Y + 5 = 2(A
–
7)
–
35
Our system is therefore
A + 5 = 3(Y
–
7) + 3
Y + 5 = 2(A
–
7)
–
35
Therefore, Yeng is 20 years old and Anthony is 37 years old.