Chen’s father was 25 when Chen was born. In 5 years Chen will be exactly half his father’s age.
a. Try to figure out how old Chen is now. Describe how you got your answer.
b. Now solve the problem using equations.
From the way you state the problem, in 5 years Chen will be 5 and his father will be 30. That won't be half.
Otherwise:
(x+25) = 2(x+5)
Solve for x, then x+25 and x+5.