Calculate Maximum Bending Moments & Stress

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Stretch69
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Can anyone help me calculate the maximum bending moments and maximum stress for the figure i uploaded please.
 

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If you want us to help us, you need to show us what you have done to attempt the question.
Because you haven't done that, I'll just ask a question.

Where will the maximum bending moment and therefore maximum stress occur on the see-saw?
 
At the spring, i need to find out the max bending moment and stress, so i will know how to find the weight of the beam i need to use in my design that can withstand that maximum stress, can u help me please?