Question: A book costs $4 more than a CD. The CD is 30% cheaper than a $20 album. How much does the book cost?
Answer: The CD is 30 / 100 * 20 = $6 cheaper than the album. So the cost of the CD is 20 - 6 = $14. The book is $4 more expensive than the CD, which means it cost 14 + 4 = $18. The answer is 18.

Question: There are 322 voters in District 1. District 2 has 19 less voters than District 3. District 3 has twice as many voters as District 1. How many total voters are in Districts 1 - 3?
Answer: D1 = 322. D3 = 2 * 322 = 644. D2 = 644 - 19 = 625. 322 + 625 + 644 = 1591. There are 1591 voters in Districts 1 - 3. The answer is 1591.

Question: Olivia gave William 10 napkins. Amelia also gives William twice the number of napkins Olivia gave him. If William had 15 napkins before, how many napkins does he have now?
Answer: After Olivia gave William 10 napkins, he ends up with 15 + 10 = 25 napkins. Amelia gives William twice the number of napkins given to him by Amelia which is 2 * 10 = 20 napkins. The total number of napkins William has now is 20 + 25 = 45 napkins. The answer is 45.

Question: Henry wants to buy a t-shirt, a pair of jeans and a pair of socks. The jeans are twice the price of the t-shirt, and the t-shirt is $10 more expensive than the socks. The socks cost $5. How much does Henry need to pay for the pair of jeans?
Answer:
The t - shirt costs $10 more than the socks, so it costs $5 + $10 = $15. The jeans are twice the price of the shirt, so they cost 2 * $15 = $30. The answer is 30.