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Questions in Grade Middle-school

[Terjawab] The ratio of North American butterflies to South American butterflies at a butterfly park is 5:3. The ratio of South American butterflies to European butterflies is 3:2. There are 30 North American butterflies at the butterfly park. A. How many South American butterflies are there? B. How many European butterflies are there?

[Terjawab] If you add 5 to me and then divide by 9, you get 3. What number am I?

[Terjawab] What is displacement divided by time?

[Terjawab] A study was done to investigate the population of polar bears over time. The correlating linear model is shown below, where \( x \) represents the number of years after 1955, and \( y \) represents the number of polar bears. Interpret the y-intercept. \[ y = 5,000 + 500x \] A. There were 10,000 polar bears in 1955. B. There were 1,000 polar bears in 1955. C. There were 5,000 polar bears in 1955. D. There were 500 polar bears in 1955.

[Terjawab] The ratio of the number of mystery books to the number of science fiction books is \( 4 : 3 \). The ratio of the number of science fiction books to the number of biographies is \( 4 : 5 \). If there are 48 science fiction books, find the total number of books.

[Terjawab] Wendy's brother drank \(\frac{3}{10}\) of the gallon of milk in the fridge. What percent of the milk did he drink?

[Terjawab] I need help with dividing fractions.

[Terjawab] A bakery bakes 184 loaves of bread in 4 hours. How many loaves does the bakery bake in 1 hour?

[Terjawab] Two factors of 30 add up to 9. What are they?

[Terjawab] All similar figures are not necessarily congruent. Give a counterexample to disprove this conjecture.