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06 Apr 2016, 06:33
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
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Question Stats:
55% (03:01) correct
45%
(02:45)
wrong
based on 129
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If r, s, t are different 1-digit positive integer and (ab) is defined as 2-digit integer such that a is the tens digit and b is the units digit, t=?
1) The product of s and (rs) is (st)
2) The sum of s and (rs) is (rt)
* A solution will be posted in two days.
1) The product of s and (rs) is (st)
2) The sum of s and (rs) is (rt)
* A solution will be posted in two days.
25 Sep 2016, 07:07
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1) The product of s and (rs) is (st)
\(s * rs = st\)
==> \(s * ( 10*r + s) = s*10 + t\)
==> \(10rs + s^2 = 10s + t\)
==> \(10rs = 10s , s^2=t\)
==> \(r =1 , t = s^2\) --{2,4} , { 3,9} , {1,1} -- Insufficient
2) The sum of s and (rs) is (rt)
\(s + rs = rt\)
==> \(s + r*10 + s = r*10 + t\)
==> \(r*10 + 2s = r*10 + t\)
==> \(r=2s\) --{1,2} , { 2,4} , { 3,6} , { 4,8} -- Insufficient
If we combine (1) and (2) only {2,4} satisfies both the equation. t=4.
Ans. C
\(s * rs = st\)
==> \(s * ( 10*r + s) = s*10 + t\)
==> \(10rs + s^2 = 10s + t\)
==> \(10rs = 10s , s^2=t\)
==> \(r =1 , t = s^2\) --{2,4} , { 3,9} , {1,1} -- Insufficient
2) The sum of s and (rs) is (rt)
\(s + rs = rt\)
==> \(s + r*10 + s = r*10 + t\)
==> \(r*10 + 2s = r*10 + t\)
==> \(r=2s\) --{1,2} , { 2,4} , { 3,6} , { 4,8} -- Insufficient
If we combine (1) and (2) only {2,4} satisfies both the equation. t=4.
Ans. C
23 Feb 2017, 04:51
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Solution:
Given: r, s and t are different single digit positive integer, “ab” is defined as 2 digit integer. It can be written as \(“10 ×a+b+1".\)
To find: The value of “t”.
Analysis of statement 1: The product of s and (rs) is (st)
We can do this problem by substituting the values ;
Case 1: Let s = 3 and r = 1; we get
\(s ×(10 ×r+s)=(10 ×s+ t)\)
\(3 ×(10 ×1+3)=(10 ×3+9)\)
Case 2: Let s = 2 and r = 1; we get
\(s ×(10 ×r+s)=(10 ×s+ t)\)
\(2 ×(10 ×1+2)=(10 ×2+4)\)
Looking at the above cases, it’s clear that, \(t = s^2\), as we can have many values for “s”, so we cannot determine the value of “t” as well. So statement 1 is not sufficient to answer. We can eliminate options A and D.
Analysis of statement 2: The sum of s and (rs) is (rt)
We can do this problem by substituting the values ;
Case 1: Let s = 3 and r = 1; we get
\(s+(10 ×r+s)=(10 ×r+t)\)
\(3+(10 ×1+3)=(10 ×1+6)\)
Case 2: Let s = 2 and r = 1; we get
\(s+(10 ×r+s)=(10 ×r+t)\)
\(2+(10 ×1+2)=(10 ×1+4)\)
Looking at the above cases, it’s clear that, \(t = 2s\), as we can have many values for “s”, so we cannot determine the value of “t” as well.
So statement 2 is not sufficient to answer. We can eliminate option B.
Combining both the statements together; we get:
From statement 1: \(t = s^2\)
From statement 2: \(t = 2s\)
This is true only when, s = 2; therefore t = 4.
So, the correct answer option is “C”.
Given: r, s and t are different single digit positive integer, “ab” is defined as 2 digit integer. It can be written as \(“10 ×a+b+1".\)
To find: The value of “t”.
Analysis of statement 1: The product of s and (rs) is (st)
We can do this problem by substituting the values ;
Case 1: Let s = 3 and r = 1; we get
\(s ×(10 ×r+s)=(10 ×s+ t)\)
\(3 ×(10 ×1+3)=(10 ×3+9)\)
Case 2: Let s = 2 and r = 1; we get
\(s ×(10 ×r+s)=(10 ×s+ t)\)
\(2 ×(10 ×1+2)=(10 ×2+4)\)
Looking at the above cases, it’s clear that, \(t = s^2\), as we can have many values for “s”, so we cannot determine the value of “t” as well. So statement 1 is not sufficient to answer. We can eliminate options A and D.
Analysis of statement 2: The sum of s and (rs) is (rt)
We can do this problem by substituting the values ;
Case 1: Let s = 3 and r = 1; we get
\(s+(10 ×r+s)=(10 ×r+t)\)
\(3+(10 ×1+3)=(10 ×1+6)\)
Case 2: Let s = 2 and r = 1; we get
\(s+(10 ×r+s)=(10 ×r+t)\)
\(2+(10 ×1+2)=(10 ×1+4)\)
Looking at the above cases, it’s clear that, \(t = 2s\), as we can have many values for “s”, so we cannot determine the value of “t” as well.
So statement 2 is not sufficient to answer. We can eliminate option B.
Combining both the statements together; we get:
From statement 1: \(t = s^2\)
From statement 2: \(t = 2s\)
This is true only when, s = 2; therefore t = 4.
So, the correct answer option is “C”.
