Question

Half of a number is 21 less than twice the number
answer

Answer 1

Let the number be x,

half of x =x/2

twice of x = 2*x 

_________________________

according to the question,

x/2  = 2x -21

x/2 + 21 = 2x

Taking LCM, (lcm = 2)

= 2x

x+42  = 2x*2

x +42 = 4x

42 = 4x-x

42 = 3x

42/3= x 

14 = x 

Now the number required here is 14

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Answer 2

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