Question

For every 6 kg of a child's weight, pediatricians prescribe 7 mg of fever reducer. If Greg weighs 42 kg, how many milligrams

of the fever reducer will the pediatrician prescribe?

Answer 1

Answer: 49 mg

Explanation:

Hi, to answer this we have to use proportions.

Proportion = weight/ mg of fever reducer

For every 6 kg of a child's weight, pediatricians prescribe 7 mg of fever reducer: 6/7

For 42 kg: 42/x

Where x is the amount in mg of fever reducer for Greg.

6 /7 = 42/x

Solving for x

x = 42/ (6/7)

x= 49

Feel free to ask for more if needed or if you did not understand something.

Answer 2

49mg

Explanation:

let's call every 7 mg of fever reducer a "dose"

Divide the weight of Greg by the weight per "dose"

42/6 = 7 doses

Each "dose" is 7mg. Multiply the number of doses by 7mg.

7 dose X 7mg = 49mg

Therefore, if Greg weighs 42kg, the pediatrician will prescribe 49mg of fever reducer.