Karen had the giant box of crayons, containing twice as many crayons as were in Beatrice's box. But Beatrice's box contained twice as many crayons as were in Gilbert's box of crayons. And Gilbert had four times as many crayons as were in Judah's box of crayons. If Karen's box contained 128 crayons, how many crayons were in Judah's box?
Let's think: If Karen's 128 crayons were twice as many as were in Beatrice's box, there were 128 / 2 = 64 crayons in Beatrice's box. And since Beatrice's box contained twice as many crayons as were in Gilbert's box of crayons, then Gilbert had 64 / 2 = 32 crayons. And since Gilbert had four times as many crayons as Judah, then Judah had 32 / 4 = 8 crayons.. The answer is: 8.

When Jayson is 10 his dad is four times his age and his mom is 2 years younger than his dad. How old was Jayson's mom when he was born?
Let's think: When Jayson is 10 his dad is 10 x 4 = 40 years old. His mom is 40 - 2 = 38 years old. When Jayson is born, his mom is 38 - 10 = 28 years old.. The answer is: 28.

The teacher told the class that if they averaged at least 75% on their final exam, they could have a pizza party. Everyone took the exam on Monday, except for William, who was allowed to take it on Tuesday. If there are 30 people in the class, and the average before he took the test was a 74%, what score does he have to get to make sure they get to have a pizza party?
Let's think: Let x be the score that William needs to achieve. Since there are 30 people in the class, there are 30 - 1 = 29 people without him. Since their average was a 74%, this means that (29 * 74 + x) / 30 > = 75. Thus, 29 * 74 + x > = 30 * 75. Thus, 29 * 74 + x > = 2250. Thus, 2146 + x > = 2250. Thus, x > = 2250 - 2146. Thus, x > = 94.. The answer is: 94.

On Thursday Walmart sold 210 pounds of ground beef. On Friday they sold twice that amount. On Saturday they only sold 150 pounds. What was the average amount of beef sold per day?
Let's think:
On Friday Walmart sold 2 * 210 pounds = 420 pounds. For all three days Walmart sold 210 + 420 + 150 pounds = 780 pounds. The average amount of beef sold per day is 780 pounds / 3 days = 260 pounds.. The answer is: 260.