How do u work out this Q? (1 Viewer)

[aliwonga]

Young’s rule for calculating the medicine dosage for infants is

D=
YA
------- *
Y+12

Where Y is the age of the infant in years and A is the adult dosage. How old is Libby if her medicine dosage is 0.6mL and the adult dosage is 15mL?

*---- means over

Ans: 11cm

 

[tommykins]

lol'd at your sig

 

[chamelia]

That is a fuckin fantastic sig!

 

[xxstef]

subbing in values,

0.6 = 15Y / Y + 12
0.6 (Y+12) = 15Y
0.6Y + 7.2 = 15Y
7.2 = 14.4Y
therefore Y = 1/2

Libby is 6months old.

how on earth can the answer be 11cm?! lol

 

[chamelia]

subbing in values,

0.6 = 15Y / Y + 12
0.6 (Y+12) = 15Y
0.6Y + 7.2 = 15Y
7.2 = 14.4Y
therefore Y = 1/2

Libby is 6months old.

how on earth can the answer be 11cm?! lol

Ah! Haha, how did I not even notice that!?? Haha!

 

[aliwonga]

apparently I found the answer in the textbook is wrong.

thank you xxstef =]

 

[kara42]

how on earth can the answer be 11cm?! Lol

fuckinglol.