Q. A doctor uses the formula in the box to calculate patients'body mass index (BMI).A patient is described as underweight if their BMI is
below 18.5 .
a Tina's mass is 48.8kg and her height is 1.56m. Is she underweight? Explain your answer.
b Stephen's height is 1.80m and his mass is 68.5kg . He wants to have a BMI of 20.How many kilograms must he lose to reach a BMI of 20 ? Show your working.Formula used by doctor for BMI: =mh2 where: m is the mass in kilograms and h is the height in metres.