Hovkial
A man bought some oranges of one type at the rate of 5 per dollar. He bought the same number of oranges of another type at the rate of 4 per dollar. He mixed both types of oranges and then sold the mix at 9 oranges for $2. After calculations, the man discovered that he made a loss of $3. What was the total number of oranges that the man bought?
(A) 90
(B) 180
(C) 540
(D) 1080
(E) 1620
Given:
1. A man bought some oranges of one type at the rate of 5 per dollar.
2. He bought the same number of oranges of another type at the rate of 4 per dollar.
3. He mixed both types of oranges and then sold the mix at 9 oranges for $2.
4. After calculations, the man discovered that he made a loss of $3.
Asked: What was the total number of oranges that the man bought?
Let the number of oranges the man bought be x.
1. A man bought x of one type at the rate of 5 per dollar.
2. He bought x oranges of another type at the rate of 4 per dollar.
He bought 2x oranges for x/5 + x/4 = $9x/20
3. He mixed both types of oranges and then sold the mix at 9 oranges for $2.
He sold oranges 2x oranges for = 2x *2/9 = $4x/9
4. After calculations, the man discovered that he made a loss of $3.
9x/20 - 4x/9 = 3
(81 - 80) x/180 = 3
x = 180 * 3 = 540
2x = 1080
IMO D