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resolution of forces

Resultant is along + y axis
answers are theta= 36.87 degrees and resultant = 80 N.
Please help me to solve it i used all my brain power lol. Thx in advance
Three concurrent force system
1) 40 N along +ve X-axis
2) 80 N making angle theta anticlockwise to -ve X-axis
2) 40N making angle theta anticlockwise to -ve y-axis
Resultant is along + y axis
answers are theta= 36.87 degrees and resultant = 80 N.
pls explain with procedure as i dont know how to calculate answers. I used sum Fx and sum Fy formula for resulatant and tan formulae but still dont get the answers.
Someone pls help me on this. Thx

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