Question

If 1 litre of milk cost 28 1/2 then the cost of 1/3 litre is​

Answer 1

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$\sf \: the \: cost \: of \: 1 \: ltr \: milk= 28 \frac{1}{2} \\ \\ = \frac{28 \times 2 + 1}{2} \\ \\ = \frac{56 + 1}{2} \\ \\ = \frac{57}{2} \\ \\ \therefore \: \sf \: cost \: of \: \frac{1}{3} \: ltr \: milk = \frac{1}{3} \times \frac{57}{2} \\ \\ = \frac{1}{ \cancel{3}} \: \times \: \frac{ \cancel{57} \: \: ^{19} }{2} \\ \\ = \frac{19}{2} \\ \\ = 9 \frac{1}{2}$

$\sf \: so \: the \: cost \: of \: \frac{1}{3} \: ltr \: milk \: is \: 9 \frac{1}{2}$

Answer 2

1 litre of milk cost= RS 28 1/2 or rs 57/2

So, 1/3 litre of milk cost= RS 57/2×1/3

=19/2 RS or 9 1/2rs

Therefore the value of 1/3 litre milk is 9 1/2 RS.