Maths, English and life skills books were distributed to 50 students in a class. 22 had maths books, 21 had english books and 25 life skills books. 7 had maths and English, 6 had maths and life skills and 9 had English and life books. 1. Find the number of students who had all three books.
2. Number of students who had 2 of the books.
3. Only life skill books

answer: r there any options?

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

just sum

10 + 10 = 20