Question

A box contains 150 oranges. If one orange is taken fron the box at random and the probability of its being rotten is 0.06, then find the number of good oranges in the box.

Answer 1

Let the number of good oranges be x
then the number of rotten oranges will be = (150-x)
__________________________
Probability of taking rotten oranges
= no. of rotten oranges/Total no. of oranges
0.06 = (150-x)/150
9 = 150-x
x = 150-9
x = 141
_____________________
Hence the number of good oranges is 141.

Answer 2

let rotten oranges be x
probability of rotten = x/ total
0.06=x/150
.06×150=x
9=x
good oranges = total - x
=150-9
=141