Question

30% of the members of a library are students, and 20% of these students are less than 18 years old. 30 students are less than 18 years old.What is the total number of members?

tell with method​

Answer 1

Step-by-step explanation:

There are 15 boys. Here's how I came to that answer. If the amount of boys in the class (represented by “X”), given that there are 25 students in total, is equal to 60 percent, you can make a simple proportion, assigning the unknown value a variable, such as X. From then, you can cross multiply and solve. Take a look:

X/25 = 60/100

100x = 1500

X = 15

Answer 2

Answer:

total number of members is 500

Step-by-step explanation:

Let the total number of members of library be X and S be number of student member.

30% of X=S and also

20% of S =30 (student less than 18 years old)

by solving we get

S=150 then again we put this value in first equation we get

X=(S*100)/30=150*100/30=500

hence total number of members is 500......