Question

A box contains 600 screws,1/10th are rusted. One screw is taken out at random from this box. Find the probability that it is a good screw.

Please......asap

Answer 1

if 1/10 are rusted in a box of 600 screws it means that 60 are rusted.
the probability of finding a food screw is:
600-60/600=540/600
=9/10
so the probability of finding a good screw is 9/10.

Answer 2

total no. of screws =600

fraction of rusted screws=1/10

no. of rusted screws=1/10*600=60 screws

new total of screws=600-60=540

p(a good screw)=540/600=9/10