Question

You are only typing what the value of X should be?

Answer 1

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Actually Welcome to the concept of ratios.

Since the above ratios are equal to each other, we get value of x as,

==> 3/12 = 5/x

==> x = 12*5 / 3

==> x = 60/3

==> x = 20

hence the value of x = 20.