You need to prepare 50g of an ointment with 15% of zinc oxide. However, your pharmacy has no zinc oxide powder and the only thing you have is two lots of zinc oxide ointment containing, respectively, 50% and 5% of zinc oxide.
1. How many grams of the 50% ointment you need to prepare this formula?

15g ointment at 50%

Step-by-step explanation:

Data

We need to prepare 50g of an ointment with 15% of zinc oxide (O15)

with a Lote 1 =50% zinc oxide

50% ⇒ 100g oinment 50g are zinc oxide, so

50g ointment 15% ⇒ 50g oinment*15zo/100g ointment = 7.5g zo, also

g ointment =100g ointment*7.5g zo*/50g zo = 15g ointment

g

step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)