Question

a man bought a certain number of oranges out of which 13 percent were found rotten. He gave 75% of the remaining in charity and still has 522 oranges left. Find how many had he bought?

Answer 1

x be the total number of oranges
$\frac{13}{100} \times x + \frac{75}{100} \times x + 522 = x$

$0.13x + 0.75x = x - 552$
$.88x - x = - 522$
$x - .88x = 522$
$.12x = 522$
$x = 522 \div .12$
x=4350