Question

16 boys went to a canteen to have tea and snacks together the bill amounted to Rs 114.40 what will be the contribution of a boy who pays for himself and 5 others
​

Answer 1

We will use basic rules of unitary method to solve this question and arrive at the answer.

Assumption: Net book of each buy is equal

Net bill of 16 boys = Rs. 114.40
By unitary method,
Net bill of 1 boy = Rs. ( 114.40 / 16 )
=> Net bill of 1 boy = Rs. 7.15

Since, a boy pays for himself and and 5 others, in total he pays for six, including himself.

Net bill of six boys = Rs. 7.15 * 6
=> Net bill of six boy = Rs. 42.9

The contribution of the boy = Rs. 42.9

Answer 2

$\underline{\underline{\textsf{Solution :}}}$

$\textsf{Given that,}$

$\textsf{total bill ( R ) = Rs 114.40}$

$\textsf{total number of boys ( N ) = 16}$

$\textsf{So, bill to be paid by each boy be}$

= $\textsf{Rs}\:\dfrac{\textsf{R}}{\textsf{N}}$

= $\textsf{Rs}\:\dfrac{\textsf{114.40}}{\textsf{16}}$

= $\textsf{Rs 7.15}$

$\textsf{When a boy will pay for himself}$
$\textsf{and 5 others,he actually will}$
$\textsf{pay for ( 1 + 5 ) = 6 boys}$

$\textsf{Thus, total bill paid by him only}$

= $\textsf{Rs ( 6 * 7.15 )}$

= $\underline{\textsf{Rs 42.90}}$