In an examination for the final year students of a school, 60 offered history, 50 economics, 16 offered history and literature, 22 offered economics and literature. If 10 candidates offered all the 3 subjects find the number that offered economics only

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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

10 - 8 = -2

  8 - 6 = -2

etc, so -2 is the common difference

step-by-step explanation: