Questions in mathematics

Questions in mathematics

[Done] McDonald's has sold more than a billion hamburgers. If it were possible to eat a hamburger every minute of every day (day and night) without stopping, how many years would it take to eat a billion hamburgers?

[Done] Your model locomotive is 18 inches long. It is an exact model of a locomotive that is 72 feet long. How many times wider is a window on the locomotive than a window on the model?

[Done] How many hours are there in a million days?

[Done] Solve the equation: \[ 10u + 7 = 8(2u - 4) - 9 \]

[Done] Simplify the expression: \[ \frac{9}{10} \div \left(\frac{1}{10} + \frac{2}{5}\right) \]

[Done] What do you call two ratios that have the same value?

[Done] What do you call two ratios that have the same value?

[Done] If light travels 671,000,000 miles per hour, how many miles will it travel in one minute?

[Done] It takes Akira 10 minutes to make a black and white drawing and 25 minutes to make a color drawing. On Saturday, he made a total of 9 drawings in 2 hours. Write and solve a system of equations to determine how many drawings of each type Akira made.

[Done] There are 50 questions to answer in a trivia contest. Each player starts with 100 points. A player earns 10 points for each correct answer but loses 4 points for each incorrect answer. Each player must answer all 50 questions. What is the fewest number of questions a contestant must answer correctly to get a score over 350?