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Byju's Answer
Standard IX
Mathematics
Ratio and Proportion
The cost of ...
Question
The cost of
7
erasers and
5
pencils is Rs.
58
and the cost of
5
erasers and
6
pencils is Rs.
56
. Formulate this problem algebraically and solve it graphically.
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Solution
Let the cost of one eraser be
x
and pencil be
y
Cost of
7
eraser and
5
pencils is
58
⇒
7
x
+
5
y
=
58........
(
i
)
Cost of
5
erasers and
6
pencils is
56
⇒
5
x
+
6
y
=
56
Solving
(
i
)
and
(
i
i
)
⇒
x
=
4
,
y
=
6
So cost of one eraser is
R
s
.4
and pencil is
R
s
.6
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