SOLUTION: 1/5 of students in a school have no brothers or sisters. Of the remaining students, 40% have 1 brother or sister. What percent of all students have more than 1 brother or sister?

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Question 312019: 1/5 of students in a school have no brothers or sisters. Of the remaining students, 40% have 1 brother or sister. What percent of all students have more than 1 brother or sister?
a 60 b 80 c 48 d 20 e 45
Answer by dcharlequin(6) About Me  (Show Source):
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1/5 of students in a school have no brothers or sisters
Lets think of it as 5/5 = 100% or 100 students
So 1/5 = 20 so 20 students in a school have no brothers or sisters
this leaves 80 students
of the remaining 80 students, 40% have 1 brother or sister
so 80 X .40 = 32
so 32 students have 1 brother or sister
what is left? 100 students minus 20 students = 80 students left then
80 students minus 32 students = 48 students left
so 48 % of students in a school have more than 1 brother or sister