Question

cost of 18 kg of rice is rupees 1440. find the cost of 12½ kg of rice​

Answer 1

In context to question asked,

We have to determine the cost of $12\frac{1}{2}\:Kg$ of rice.

From the question,

Cost of 18 kg of rice = Rs. 1440

So, for determining the cost of  $12\frac{1}{2}\:Kg$ of rice, we will determine first the cost of 1 Kg of rice.

So, for determining the cost of 1 Kg of rice we will divide the cost of 18 Kg of rice by 18.

So, we will get,

The cost of 1 Kg of rice will be $=\frac{1440}{18} = Rs.\:80$

So, now determining the cost of  $12\frac{1}{2}\:Kg$ of rice.

We will multiply the quantity  $12\frac{1}{2}\:Kg$ of rice by the cost of unit Kg of rice.

Hence, we will get,

$12\frac{1}{2}\times 80=>Rs.\:1000$

Hence, cost of  $12\frac{1}{2}\:Kg$ of rice will be Rs. 1000.

Answer 2

Given: The cost of a $18$kg of rice is rupees Rs$1440$.

We have to find the cost of a $12\frac{1}{2}$kg of rice​.

We are solving in the following way:

We have,

The cost of a $18$kg of rice is rupees Rs$1440$.

So, the cost of one kg. of rice will be:

$\Rightarrow\frac{1440}{18} \\\\\Rightarrow 80$

Hence, the cost of one kg. of rice is Rs$80$.

So, the cost of a $12\frac{1}{2}$kg of rice​ will be:

$\Rightarrow 80\times12\frac{1}{2} \\\\\Rightarrow 80\times\frac{25}{2} \\\\\Rightarrow 1000$

Hence, the cost of a $12\frac{1}{2}$kg of rice​ will be $1000$Rs.