Question

The cost of a dozen eggs is 60 Rupees. Then determine the cost of 4 eggs.

Answer 1

Hint: In order to determine the cost of 4 eggs, we use the given data and calculate the cost that a single egg comprises. Using this relation we can find how much 4 eggs cost.

Complete step-by-step answer:

Given Data,

Dozen eggs cost 60 Rupees.

Let us consider the cost of one egg to be ‘x’ Rupees.

One dozen of eggs means 12 eggs. (1 dozen = 12)

The cost of one egg is determined by dividing the total cost of eggs by the total number of eggs.

$\Rightarrow {\text{x = }}\dfrac{{60}}{{12}}$

$\Rightarrow {\text{x = 5 Rs}}$

Now the cost of 4 such eggs would be nothing but the cost of one egg multiplied by 4.

$ \Rightarrow {\text{Cost of 4 eggs = 5}} \times 4$

$ \Rightarrow {\text{Cost of 4 eggs = 20 Rs}}$

Hence the cost of 4 eggs is 20 Rupees.

Note: In order to solve this type of question the key is to know the concepts of ratio and proportion. By determining the cost of one egg, we can calculate the cost of how many eggs by just multiplying them.

It is important to always know the meanings of general terms of measuring quantity such as dozen in this case. Dozen is one of the most primitive groupings used for measurement in day to day life.

There are other similar quantities of measurement like gross which means twelve dozens or 144 items, small gross which is 120 items or ten dozens and a long dozen which is 13 items.