Question

a man donated three eleventh
of his salary to a charity fund he deposited one fourth of his amount left in his savings account if he is left with Rs 4200 calculate his total salary

Answer 1

$let \: salary \: is \: x$
Money donated in Charity fund
$x \times \frac{3}{11}$
left amount
$x - x \frac{3}{11} = \frac{8x}{11}$
money deposited in saving account
$\frac{8x}{11} \times \frac{1}{4 } = \frac{8x}{44}$
amount left =
$\frac{8x}{11} - \frac{8x}{44 } = 4200 \\ \\ \frac{24x}{44 } = 420 \\ \\ x = \frac{420 \times 44}{24} = 7700$
so the salary of the person is 7700.