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Quantitative Aptitude
Mixture & Alligations
TWO COWS WERE...
Question
TWO COWS WERE BOUGHT AT THE SAME COST EACH. ONE WAS SOLD AT A PROFIT OF 5% AND THE OTHER WAS SOLD AT A LOSS OF 7%. IF THE ACTUAL DIFFERENCE OF THE SELLING PRICES WERE RS 144, WHAT IS THE COST PRICE OF EACH COW?
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Solution
Let
the
CP
of
first
cow
=
Rs
x
Profit
on
first
cow
=
5
%
⇒
Profit
CP
×
100
%
=
5
%
⇒
Profit
x
×
100
=
5
⇒
20
profit
=
x
⇒
20
SP
-
CP
=
x
⇒
20
SP
-
x
=
x
⇒
20
SP
-
20
x
=
x
⇒
20
SP
=
21
x
⇒
SP
of
first
cow
=
Rs
21
20
x
Let
the
CP
of
second
cow
=
Rs
x
loss
on
first
cow
=
7
%
⇒
loss
CP
×
100
%
=
7
%
⇒
loss
x
×
100
=
7
⇒
100
loss
=
7
x
⇒
100
CP
-
SP
=
7
x
⇒
100
x
-
SP
=
7
x
⇒
100
x
-
100
SP
=
7
x
⇒
100
SP
=
93
x
⇒
SP
of
second
cow
=
Rs
93
100
x
Now
,
SP
of
first
cow
-
SP
of
second
cow
=
Rs
144
⇒
21
x
20
-
93
x
100
=
144
⇒
105
x
-
93
x
100
=
144
⇒
12
x
100
=
144
⇒
x
=
1200
So
,
CP
of
each
cow
=
Rs
1200
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