Question

the cost of 5 kg of rice is rd.82.5.Find the cost of 7.5 kg of rice

Answer 1

Cost of 5 kg rice = ₹ 82.5

Cost of 1 kg rice =

$\frac{82.5}{5} = \frac{825}{50} = 16.5$
Cost of 7.5 kg of rice = 16.5× 7.5

=₹ 123.75

The method used is unitary method .

Answer 2

$given: \\ cost \: of \: 5 \: kg \: of \: rice = 82.5 \: rupees. \\ \\ find: \\ cost \: of \: 7.5 \: kg \: of \: rice.$

$i'm \: using \: unitary \: method \: here: \\ \\ cost \: of \: 1 \: kg \: of \: rice = \frac{cost \: \: of \: the \: rice \: for \: the \: given \: weight}{given \: weight \: of \: rice} \\ = \frac{82.5}{5} \\ = \frac{825}{50} \\ = 16.5 \: rupees.$

Cost of 7.5 kg of rice = 7.5*16.5 = 123.75 rupees.