Aptitude - Simple Interest - Discussion
Discussion Forum : Simple Interest - Data Sufficiency 2 (Q.No. 1)
Directions to Solve
Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.
1.
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. |
Answer: Option
Explanation:
Clearly, any two of the three will give us the answer.
Correct answer is (E).
Discussion:
31 comments Page 2 of 4.
Moncy Kurien said:
1 decade ago
We can find the principal amount by using the options I and II. But how can we find the principal amount using either I and III or II and III? Please explain.
Chaud said:
1 decade ago
P + P.3.r% = 690---(1).
P + P.5.r% = 750---(2).
Divide eqn 1 by 2 to get r and then p.
Please explain how to divide 1 by 2 to get r and then p?
P + P.5.r% = 750---(2).
Divide eqn 1 by 2 to get r and then p.
Please explain how to divide 1 by 2 to get r and then p?
Aman said:
1 decade ago
According to third equation rate of interest is 5% so putting that in second equation that is p + p*rate*time/100 = sum.
p + p*5*5/100 = 750.
p + p*5*5/100 = 750.
(1)
Girish said:
9 years ago
690 - P = 3PR.
750 - p = 5PR.
Dividing both equations
(690 - P)/(750 - P) = 3/5.
-> (690 - P)5 = (750 - P)3.
By solving;
P = 600.
750 - p = 5PR.
Dividing both equations
(690 - P)/(750 - P) = 3/5.
-> (690 - P)5 = (750 - P)3.
By solving;
P = 600.
(3)
Akshaya said:
1 decade ago
Hi Abcd,
Using II & III
p+((p*5*5)/100)=750 .....(1)
Solving (1),we get p=600.
Similarly,we can do with I & III
Using II & III
p+((p*5*5)/100)=750 .....(1)
Solving (1),we get p=600.
Similarly,we can do with I & III
P V Snehil said:
8 years ago
We cannot get P using I and II, as we donot know the are when we have only these two statements.
Correct answer is D.
Correct answer is D.
(2)
Mansi Arora said:
8 years ago
Hi @Aryan,
We are using here all the three given statements to get the value of P which is not given in the options.
We are using here all the three given statements to get the value of P which is not given in the options.
Shruthi said:
8 years ago
If it is any two of the 3 then there is a possibility of taking 1 and 2.
How can we get p using 1 and 2?
How can we get p using 1 and 2?
(1)
Anandhi D said:
1 decade ago
I cannot understand Please explain the formula of this question and give me some easy way.
Abcd said:
1 decade ago
P + P.3.r% = 690---(1)
P + P.5.r% = 750---(2)
divide eqn 1 by 2 to get r and then p.
P + P.5.r% = 750---(2)
divide eqn 1 by 2 to get r and then p.
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