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### Discussion :: Alligation or Mixture

1. What is the sum which earned interest?

I. The total simple interest was Rs. 7000 after 7 years.

II. The total of sum and simple interest was double of the sum after 5 years.

2. A.
 I alone sufficient while II alone not sufficient to answer
B.

II alone sufficient while I alone not sufficient to answer

C.

Either I or II alone sufficient to answer

D.

Both I and II are not sufficient to answer

E.

Both I and II are necessary to answer

Explanation :

I gives, S.I. = Rs. 7000 and T = 7 years.

II gives, Sum + S.I. for 5 years = 2 x Sum          Sum = S.I. for 5 years.

Now, S.I. for 7 years = Rs. 7000.

 S.I. for 1 year = Rs.$$\frac { 7000 } { 7 }$$ = Rs. 1000.

Thus, I and II both are needed to get the answer.

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