Coby went on a road trip. He is traveling from Washington to Nevada but he needs to stop in Idaho which is 640 miles away from Washington and 550 miles away from Nevada to pick up some friends. If Coby is traveling at a speed of 80 miles per hour going to Idaho and at a speed of 50 miles per hour from Idaho to Nevada, how many hours did it take for him to arrive at the destination?
Let's think: The estimated time of arrival from Washington to Idaho is 640 / 80 = 8 hours. So, the estimated time of arrival from Idaho to Nevada is 550 / 50 = 11 hours. Therefore, It took him 11 + 8 = 19 hours to arrive at the destination.. The answer is: 19.

Kim has 12 nail polishes. Heidi has 5 more nail polishes than Kim, and Karen has 4 fewer nail polishes than Kim. How many nail polishes does Karen and Heidi have together?
Let's think: Heidi has 12 + 5 = 17 nail polishes. Karen has 12 - 4 = 8 nail polishes. Heidi and Karen have 17 + 8 = 25 nail polishes together.. The answer is: 25.

Mrs. Fredrickson has 80 chickens where 1/4 are roosters and the rest are hens. Only three-fourths of those hens lay eggs. How many chickens does Mr. Fredrickson have that do not lay eggs?
Let's think: Mrs. Fredrickson has 80 x 1 / 4 = 20 roosters. So he has 80 - 20 = 60 hens. Only 60 x 3 / 4 = 45 of the hens lay eggs. Thus, 60 - 45 = 15 hens do not lay eggs. Therefore, Mr. Fredrickson has a total of 15 hens + 20 roosters = 35 chickens that do not lay eggs.. The answer is: 35.

Anna spent 1/4 of her money, and now she has $24 left. How much did she have originally?
Let's think:
Let X be the amount Anna had originally. She spent X * 1 / 4 and has X - X * 1 / 4 = $24 left. Combining like terms, we get X * 3 / 4 = $24. Dividing both sides by 3 / 4, we get X = $32.. The answer is: 32.