[Question]: Chantal knits sweaters to sell. Each sweater takes 4 balls of yarn. Each ball of yarn costs $6. How much money will Chantal gain in all 28 sweaters if she sells each sweater for $35?
[Answer]: The 28 sweaters need 28 x 4 = 112 balls of yarn. So, Chantal will spend 112 x $6 = $672 in all for the balls of yarn. Her total earnings for selling 28 sweaters is $35 x 28 = $980. Therefore, Chantal will gain $980 - $672 = $308.
So the answer is 308.

[Question]: Bill had to finish a project from work that was to take him 4 days. If he took 6 seven-hour naps in the four days, how long did he spend working on the project?
[Answer]: Since a day has 24 hours, the project was to take 24 * 4 = 96 hours. Bill took 6 seven - hour naps during the four days, a total of 6 * 7 = 42 hours. The time he spent working on the project is 96 - 42 = 54 hours.
So the answer is 54.

[Question]: Lionel walked 4 miles. Esther walked 975 yards and Niklaus walked 1287 feet. How many combined feet did the friends walk?
[Answer]:
Lionel = 4 * 5280 = 21120 feet. Esther = 975 * 3 = 2925 feet. Together = 21120 + 2925 + 1287 = 25332 feet. Together the friends walked 25332 feet.
So the answer is 25332.