1. In a survey about liking for colors, it was found that everyone who was surveyed had
a liking for at least one of the three colors namely Red, Green and Blue. Further 30%
liked Red; 40% liked Green and 50% liked' Blue. ' Further 10% people liked both Red
and Green, 5% liked both Green and Blue and 10% liked both Red and Blue. Find the
percentage of the surveyed people who liked all the colors.