Question: Aida has twice as many dolls as Sophie, and Sophie has twice as many dolls as Vera. How many dolls do Aida, Sophie, and Vera have combined if Vera has 20 dolls?
Answer: If Sophie has twice as many dolls as Vera, then she has 2 * 20 dolls = 40 dolls. Aida has 2 * 40 dolls = 80 dolls, twice the number Sophie has. In total, they have 80 dolls + 40 dolls + 20 dolls = 140 dolls. The answer is 140.
[Question]During one hour, Tom can read 12 pages of a book. How many pages would he be able to read during 2 hours if he could increase his reading speed by a factor of 3?
[Answer]If Tom could triple his reading speed, he could read 12 * 3 = 36 pages of a book in one hour. Therefore, during two hours he could read 36 * 2 = 72 pages. The answer is 72.
Q: Mike is 16 years old. His sister Barbara is half as old as he is. How old is Barbara going to be when Mike is 24 years old?
A: Barbara is currently 16 years / 2 = 8 years old. Mike is going to be 24 years old after 24 years - 16 years = 8 years. So Barbara is going to be 8 years + 8 years = 16 years old. The answer is 16.
Question: Ten more than twice the number of birds on the fence is 50. How many birds are on the fence?
Answer: Let x be the number of birds on the fence. We know that 10 + 2 * x = 50. Subtracting 10 from both sides, we get 2 * x = 50 - 10 = 40. Dividing both sides by 2, we get x = 20. The answer is 20.
[Question]A plumber bought 10 meters of copper and 5 more meters of plastic pipe. If each meter cost $4, how much did the plumber spent on the copper and plastic pipe?
[Answer]He bought 10 + 5 = 15 meters of plastic pipe. The total meters of the copper and plastic pipe is 10 + 15 = 25. The plumber spent $4 x 25 = $100 on copper and plastic pipe. The answer is 100.
[Question]A pair of dogs are barking back and forth at each other from across the street. The poodle barks twice for every one time the terrier barks. The terrier’s owner hushes it every second time it barks. She has to say “hush” six times before the dogs stopped barking. How many times did the poodle bark?
[Answer]
The terrier barked twice as many times as it was told to hush, so it barked 6 * 2 = 12 times. The poodle barked two times for every terrier bark, so it barked 12 * 2 = 24 times. The answer is 24.