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.

2 answers

in 5 years father will be 30.
So, Chen will be 15.
So, Chen is now 10.
no, forget that.
father is c+25
in five years,

c+25+5 = 2(c+5)
c = 20

so, Chen is 20, and father is 45. In 5 years, he will be 25 and his father will be 50.