Question

what number must be added to each of the number 18 20 21 24 to get the number which are proportion​

Answer 1

Answer:

let the no to be x

then equation will form like

hope it will help you to get rid of your question

Answer 2

Answer: x=12

Step-by-step explanation:  18+x/20+x :: 21+x/24+x

21+x(20+x)=24+x(18+x)

=>420+21 x+20 x+ x^2(x square)=432+24 x +18 x+x^2

  => 420-432+x^2-x^2=42 x - 41 x

           =>  -12=-x

                         =>12 = x

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