Order Entry & ProcessingCâu 88 / 100
You must prepare 60 g of a 5% hydrocortisone ointment using a 10% ointment and a 2% ointment. How much of each is required?
a.37.5 g of the 10% and 22.5 g of the 2%
b.22.5 g of the 10% and 37.5 g of the 2%
c.30 g of the 10% and 30 g of the 2%
d.15 g of the 10% and 45 g of the 2%
Giải thích
By alligation, the 10% gets 5 - 2 = 3 parts and the 2% gets 10 - 5 = 5 parts, for 8 total parts. 60 g / 8 = 7.5 g per part, so 3 x 7.5 = 22.5 g of the 10% and 5 x 7.5 = 37.5 g of the 2%. The classic error is assigning the parts to the wrong strength, which reverses the two answers.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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