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Simple Interest - General Aptitude

Q1:

What is the principal sum?
I.  The sum amounts to Rs. 690 in 3 years at S.I.
II.  The sum amounts to Rs. 750 in 5 years at S.I.
 III.  The rate of interest is 5% p.a.

A I and III only

B II and III only

C I and II only

D I and III only, or II and III only

E Any two of the three

ANS:E - Any two of the three

Clearly, any two of the three will give us the answer.  Correct answer is (E).