Question

There were 35 balls in a bag, some of which were yellow and the rest were green. If the probability of picking a yellow ball is 0.2, how many yellow balls were in the bag?

Answer 1

0.2 is nothing but 1/5
therefor
$35 \div 1 \div 5$
hence, there were 7 yellow balls...

Answer 2

the probability of getting rest balls that are green is 0.8