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If $$u + v = 84$$ and $$u - v = 4$$, then $$u : v$$ is equal to:
u + v = 84 Eq.(i)
u - v = 4 Eq.(ii)
Add Eq.(i) and Eq.(ii)
u + v + u - v = 84+4
2u = 88
u = 44
Put the value of 'u' in Eq.(ii).
44 - v = 4
v = 44-4
v = 40
So u : v = 44 : 40
= 11 : 10
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