a fruit seller had some oranges . he sells 20 % oranges and still has 400 oranges . how many oranges he had originally ?
"explanation : he sells 20 % of oranges and still there are 400 oranges remaining = > 80 % of oranges = 400 ⇒ ( 80 × total oranges ) / 100 = 400 ⇒ total oranges / 100 = 5 ⇒ total oranges = 5 × 100 = 500 answer : option d"
add(400, multiply(400, divide(20, const_100)))