Question

14 apples cost Rs. 140. The cost of one apple is _____.

Answer 1

Hint:
In this question the cost of articles is given and we have to find the cost of 1 article. If you want to calculate the cost of one article you have to divide the cost of articles with the number of articles. Here, the number of articles is 14 and cost of that 14 articles is equal to Rs. 140.

Complete step by step solution:
First of all, let us see what is given to us. We are given that the cost of 14 apples is equal to Rs. 140 i.e.
$ \Rightarrow {C_{14}} = Rs.140$
$ \Rightarrow N = 14$
Where ${C_{14}}$ is the cost of 14 apples and N is the number of apples.
Now, see what we have to find the cost of one apple i.e. ${C_1}$ is given by
$ \Rightarrow {C_1} = \dfrac{{{C_{14}}}}{N}$
Putting the values of ${C_{14}}$ and N in this we get,
$ \Rightarrow {C_1} = \dfrac{{140}}{{14}}$
Dividing the numerator with denominator we get,
$ \Rightarrow {C_1} = Rs.10$

Therefore, the cost of one apple is equal to Rs. 10.

Note:
Most students make mistakes by doing multiplication but when you are given the cost of some numbers of articles and we have to find the cost of one article then we will do division. It's obvious that the cost of more articles is more than the cost of one article and if we multiply the two numbers, we get a greater number but if we divide two numbers, we get a lesser number.
But if we are given the cost of one article and we have to find the cost of some number of articles then we will multiply the cost with the number of articles.
Now, further in this question if they asked for the cost of some other number of articles then we multiply the number with the cost of one article. E.g. we have to find coat of 12 articles then
$
   \Rightarrow {C_{12}} = {C_1} \times N \\
   \Rightarrow {C_{12}} = 10 \times 12 = Rs.120 \\
$
Therefore, the cost of 12 articles is equal to Rs. 120.
Make sure that you write the unit in the answer.