The cost of 4 pens and 8 pencils is rs 84. if one pen costs rs12 more than the cost of one pencil, find the cost of one pen and pencil separately
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x=pens
y=pencil
therefore
y=pencil
therefore
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4x+8y=84
divide whole equation by 4
we get ,
x+2y=21 ••••••••(1)
and,
x-y=12 •••••••••(2)
solve equation 1&2
we get,
cost of pen(x) = 15 Rs
cost of pencil(y)= 3 Rs
divide whole equation by 4
we get ,
x+2y=21 ••••••••(1)
and,
x-y=12 •••••••••(2)
solve equation 1&2
we get,
cost of pen(x) = 15 Rs
cost of pencil(y)= 3 Rs
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