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no1
2 : 3 : 4 =180
2x +3x +4x =180
9x =180
x =180/9
=20
2=2x20=40
3=3x20=60
4=4x20=80
no2
180-75=105
3a+4a=7a
7a=105
a=105/7
a=15
no 3
lancip
9x = 180
x= 20
→ 2x 20 : 40
→ 3 x 20 : 60
→ 4 x 20 : 80
→→ D
2. 75 + 3a + 4a : 180
75 + 7a : 180
7a : 105
a : 15 (A)
3. D. lancip