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put this solution on YOUR website!Let Chan be C years old.
His cousin, Zeke (we'll call him that), is Z years old.
"Chan is 4 times older than Zeke."
1.

In 8 years, Chan will be (C+8) years old and Zeke will be (Z+8) years old.
"In 8 years Chan will be two times older than Zeke."
2.

2.

Substitute eq. 1 into 2 and solve for Z.
2.

Then from eq. 1,
1.

Check the answer.
In eight years, Chan will be 24 and Zeke will be 12.