Question: The Ravenswood forest has four times as many gnomes as the Westerville woods. If there are 20 gnomes in Westerville woods, how many gnomes would remain in Ravenswood forest if 40% of the gnomes are taken for use by the forest owner?
Answer: If there 20 gnomes in Westerville woods, the Ravenswood forest has 4 * 20 = 80 gnomes. If 40% of gnomes in the Ravenswood forest are taken for use by the owner of the forest, the number of gnomes will reduce by 40 / 100 * 80 = 32. The number of gnomes that will remain is 80 - 32 = 48. The answer is 48.

Question: Arnold owns three cars. The first car averages 50 miles per gallon of gas. The second car averages 10 miles per gallon of gas. And the third car averages 15 miles per gallon of gas. He splits his 450-mile monthly driving mileage equally amongst his three cars. If gas costs $2 per gallon, how much does he spend on gas each month?
Answer: He drives each vehicle 150 miles because 450 / 3 = 150. The first car will need 3 gallons of gas because 150 / 50 = 3. The second car will need 15 gallons of gas because 150 / 10 = 15. The third car will need 10 gallons of gas because 150 / 15 = 10. He will need 28 gallons in total because 3 + 15 + 10 = 28. This will cost him $56 because 28 x $2 = $56. The answer is 56.

Question: Isabella has three times as many green houses as yellow houses. She also has 40 fewer yellow houses than red houses. If she has 90 green houses, how many of her houses are not yellow?
Answer: If the number of green houses is three times the number of yellow houses, and there are 90 green houses, then there are 90 / 3 = 30 yellow houses. She also has 40 fewer yellow houses than blue houses, meaning there are 30 + 40 = 70 blue houses. The number of houses that are not yellow is 70 blue houses + 90 green houses = 160. The answer is 160.

Question: There are 18 green leaves on each of the 3 tea leaf plants. One-third of them turn yellow and fall off on each of the tea leaf plants. How many green leaves are left on the tea leaf plants?
Answer:
In total, the 3 tea leaf plants have 18 x 3 = 54 green leaves. One - third of the yellow leaves falling off of all plants is 54 / 3 = 18. The number of remaining green leaves on the plants is 54 - 18 = 36. The answer is 36.