 QUESTION

# Two mobile cost 16,000 rupees. How much money will be required to buy 13 such mobiles?

Hint: In these types of questions we will use the unitary method for this. We will first of all try to determine the cos of one mobile phone and then by multiplying the cost of one mobile phone, we will proceed to determine the cost of 13 such mobile phones.

Given that the cost of two mobile phones is 16,000 rupees. We have to find out the cost of 13 such mobile phones. To find this, we will first of all try to find the cost of one mobile phone.
To find out the cost of one mobile phone we will use unitary method,
Given that the cost of two mobile phones is given as,

Cost of two mobiles = 16,000Rs.
Therefore, the cost of 1 mobile= $\dfrac{16000}{2}=8000$Rs.
So, we obtained the cost of 1 mobile is Rs.8000.
Now applying unitary method, to find the cost of such 13 mobile phones we get,
Cost of 13 mobiles = 13×8,000 = Rs. 1,04,000.
So, we get the cost 13 mobiles = Rs. 1,04,000.
Therefore, the cost of 13 such mobile phones is Rs. 1,04,000.

Note: The possibility of error in this question is that you can directly go for calculating the cost of 13 such mobile phones, which would give the wrong result. We need to determine by unitary method the cost of one mobile phone.