Maths-
General
Easy

Question

Based on Current’s formula, what is w in terms of A ?
Mosteller’s formula: A = fraction numerator square root of h w end root over denominator 60 end fraction
Current’s formula: A = fraction numerator 4 space plus space w over denominator 30 end fraction
The formulas above are used in medicine to estimate the body surface area A, in square meters, of infants and children whose weight w ranges between 3 and 30 kilograms and whose height h is measured in centimetres.

  1. w = 30A − 4
  2. w = 30A + 4 
  3. w = 30 (A − 4)   
  4. w = 30 ( A + 4)

The correct answer is: w = 30A − 4


    HINT – Do cross multiplication
    SOLUTION -  Current’s formula :  A =  fraction numerator 4 space plus space w over denominator 30 end fraction
    rightwards double arrow30 A = 4 + w
    rightwards double arrow30 A – 4 = w
    So, option A is correct

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