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Q.

Find x, if Question Imageare in proportion.


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a

20

b

10

c

12

d

8 

answer is A.

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Detailed Solution

Concept- Two numbers are  proportional  if one number is in constant proportion to another. A proportional relationship is a relationship between two variables that have equal proportions. Another way to look at it is that in a proportional relationship, one variable is always a constant value multiplied by the other variable. This constant is known as the "constant of proportionality".
x,15,36,27 or later is proportional, so you can write:
Question ImageQuestion ImageQuestion ImageQuestion ImageHence, the option 1 is correct
 
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Find x, if are in proportion.