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Question is this;

A short compression member is fabricated from 2 steel pipes. the pipe on the top has a cross sectional area of 3.17 in sq and is 4" long. The pipe on the bottom has a cross sectional area of 5.53 in sq and is 6" long.

Each pipe has a downward force at the centre-top of each pipe.

The allowable compressive stress in the steel is 21.6 ksi.

a) What is the allowable load in the bottom pipe if the load in the top pipe is 22 kips?

b) What is the allowable load in the top pipe if the load in the bottom pipe is 40 kips?

the answer for a) is 97.4 kips and b) is 68.5 kips.

I've tried most stress formulas but there must be something I am missing. If you're able to show guidance, I'd appreciate the help. Thanx

-M