Question 929561
sum of all angle of triangle = 180° 
let,
1st angle= F° 
2nd angle= F°-5°
3rd anle= 3F° 
equation
F°+(F°-5°)+3F° =180° 
5F°-5°=180°
5f°=185°
F°=185°/5°
F°=  37°