NYUZI-4

Tafuta thamani ya a katika umbo lifuatalo:

Suluhu

3a + 3a + (a + 20) + (a + 20) = 360

6a + (a + 20) + (a + 20) = 360

6a + 2a + 40 = 360

8a + 40 = 360

8a = 360 – 40

8a = 320

8a  =  320

8          8

a= 40

Hivyo thamani ya a ni 40