- Home
- Standard 13
- Quantitative Aptitude
4.Average
easy
There was one mess for $30$ boarders in a certain hostel. On the number of boarders being increased by $10,$ the expenses of the mess were increased by $Rs.\,40$ per month while the average expenditure per head diminished by $Rs.\,2.$ Find out actual monthly expenses. (in $Rs.$)
A
$390$
B
$410$
C
$360$
D
$480$
Solution
Let, $Rs.\, x$ be the average expenditure for $30$ boarders. $\therefore \quad 30 x+40=(x-2) \times 40 \quad$ or, $\quad x=12$
Hence, actual expenditure $=Rs.\, 12 \times 30=Rs.\, 360$.
Standard 13
Quantitative Aptitude