A revision question that i have been stuck on, hope you can help

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The discussion revolves around a revision question where the user is struggling to derive the answer of 112KN. It highlights the importance of having information on the areas of the cylinders involved in the calculation. A participant notes that while lengths are provided, they may not be relevant aside from buckling considerations. Additionally, there is a mention of a calculated area ratio of 7/16 between the two cylinders. The conversation encourages sharing previous attempts to identify any mistakes in the approach.
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Attached is a question from my book, I know that the answer is 112KN but can't work out the method for getting there. Hope you can help, James
 

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You need to have some sort of information on the areas.
 
Which is funny because he has lengths which aside from buckling don't seem to serve any purpose.
 
You didn't give the areas, but by my calculations, it looks like the ratio of the areas of the two cylinders is 7/16. Is that right?

Let's see what you've tried so far and maybe we can spot your error.
 

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