Peter surveyed his family to see what they like to drink with breakfast. He found that 1/10 of the people like to drink grapefruit juice and 3/10 of them like to drink orange juice. What part of the people surveyed prefer grapefruit or orange juice with breakfast?Express your answer in simplest form.
4/10 of the surveyed people like either grapfruit or orange juice. Say the family has 10 members, and 1 person likes grapefruit, but then 3 other people like orange juice. That's 4 members out of 10.
