in an examination 35 % of the students passed and 520 failed . how many students appeared for the examination ?
"let the number of students appeared be x then , 65 % of x = 520 65 x / 100 = 520 x = 520 * 100 / 65 = 800 answer is c"
divide(multiply(520, const_100), subtract(const_100, 35))