Matemáticas II

The population of a certain town increases by 50 percent every 50 years. If the population in 1950 was 810, in what year was the population 160?

Five percent of a certain grass seed is timothy. If the amount of the mixture needed to plant one acre contains 2 pounds of timothy, how many acres can be planted with 240 of the seed mixture?

A brush salesman earns $50 salary each month plus 10 percent commission on the value of his sales. If he earned $200 last month, what was the total value of his sales?

A man bought 10 crates of oranges for $80 total. If he lost 2 of the crates, at what price would he have to sell each of the remaining crates in order to earn a total profit of 25 percent of the total cost?

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An alloy of tin and copper has 6 pounds of copper for every 2 pounds of tin. If 200 pounds of this alloy are made, how many pounds of tin are required?

A sporting goods store ordered an equal number of white and yellow tennis balls. The tennis ball company delivered 30 extra white balls, making the ratio of white balls to yellow balls 6:5. How many tennis balls did the store originally order?

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An optometrist charges $30.00 for an eye examination, frames, and glass lenses, but $42.00 for an eye examination, frames, and plastic lenses. If the plastic lenses cost 4 times as much as the glass lenses, how much do the glass lenses cost?

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If the product of two integers is an even number and the sum of the same two integers is and odd number, which of the following must be true?

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A wire is cut into 3 equal parts. The resulting segments are then cut into 4, 6 and 8 equal parts, respectively. If each of the resulting segments has an integer length, what is the minimum length of the wire?

How many positive integers less than 60 are equal to the product of a positive multiple of 5 and an even number?

If the average (arithmetic mean) of 18 consecutive odd integers is 534, then the least of these integers is

During one week, a stock closed at $75.58 on Monday, $ 75.63 on Tuesday, $75.42 on Wednesday, and $75.52 on Thursday. If the average (arithmetic mean) closing price for the 5 days was $75.50, what was the closing price on Friday?

The average (arithmetic mean) of 6 positive numbers is 5. If the average of the least and greatest of these numbers is 7, what is the average of the other 4 numbers?

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