Out of a total of 800 radio 20 are black and 10 are too green The remainder is white If a radio is s...........

Explanation:

Total number of radio =800

 Number of black radio =20% of 800

=20×800/100

=160

Number of green radio =10% of 800

=10×800/100

=80

Number of white =800-240

=560

Thus the required probability=560/800

=7/10