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If a,b are the roots of x^2 - 10cx-11d =...

If a,b are the roots of `x^2 - 10cx-11d = 0` and c,d are roods of `x^2- 10ax - 11b = 0` then value of a+b+c+d is:

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a+b=10c-(1)
ab=-11d-(2)
c+d=10a-(3)
cd=-11b-(4)
adding 1 and 3
a+b+c+d=10(a+c)
b+d=9(a+c)-(5)
`a^2-10ac-11d=0-(6)`
...
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