Question

if 8 kg of rice cost 420 rupees . Find the cost of 18 kg of rice ​

Answer 1

★ Given :

$\bf8 kg \: of \: rice \: cost \: is \: 420 rs$

$\:$

★ To Find :

$\bf \: Cost \: of \: 18 \: kg \: of \: rice$

$\:$

★ Solution :

$\bf8kg \: of \: rice = 420rs$

$\bf1kg \: of \: rice = \: ?$

$\:$

$\red{ \bf \underline{ Cross \: Multiplication}}$

$\: \red⟹ \: \displaystyle \bf \frac{420 \times 1}{8}$

$\: \red ⟹ \: \displaystyle \bf \frac{ \cancel{420}\: ^{52.5} }{ \cancel{8} \: _{1}}$

$\displaystyle \: \red⟹ \bf \: 52.5$

$\:$

$\bf1kg \: of \: rice = 52.5$

$\bf18kg \: of \: rice = \: ?$

$\: \ ⟼ \: \red{\bf \: 52.5 \times 18}$

$\: \ ⟼ \: \red{\bf \: 945 }$

∴ The cost of 18 kg of rice is 945rs

Answer 2

As per the data given in the question.

In the above question it is given that,

The given data is cost of 8 kg of rice is Rs.420

We have to find the cost of 18kg.

Here we have to know the price of 1kg then multiply by 18 to get the value.

Thus, the cost of 1 kg of rice is,

$=\frac{420}{8} \\=Rs.52.5$

Therefore price of 18 kg of rice is,

$=52.5\times 18\\=Rs.945$

Hence the cost of 18 kg rice is Rs.945