Question

The cost of a dozen eggs is $Rs.30$. What will be the cost of 15 eggs?

Answer 1

Hint: In order to find the cost of the given number of eggs. First with the help of information given, try to find the cost of a single piece of egg and finally find the cost of total eggs.

Complete step-by-step answer:
Given that:- The cost of dozen eggs is $Rs.30$
As we know that 1 dozen eggs = 12 eggs
So, the cost of 12 eggs is $Rs.30$
Then the cost of one egg
$
   = \dfrac{{{\text{cost of 12 eggs}}}}{{12}} \\
   = \dfrac{{Rs.30}}{{12}} \\
   = Rs.\dfrac{5}{2} \\
 $
Now in order to find the cost of 15 eggs we multiply the cost of each egg by 15.
$\therefore $ Cost of 15 eggs $ = Rs.\dfrac{5}{2} \times 15 = Rs.37.5 $
Hence, the cost of 15 eggs is Rs.37.50.

Note: In order to solve such questions involving cost of n number of items and we need to find cost of given number of such items. Always try to find out the cost of each item and finally the cost of the given number of items. Also these types of questions can be solved by the means of ratio between the number of items and costs.