[Question]: If 100 pieces, each 15 centimeters long, are cut from a 51-meter long ribbon, how much ribbon remains ?
[Answer]: The total length cut from the 51 - meter ribbon is 100 x 15 centimeters = 1500 centimeters. Since 1 meter is equal to 100 centimeters, then 1500 centimeters is equal to 1500 / 100 = 15 meters. Therefore, 51 - 15 = 36 meters of ribbon remains.
So the answer is 36.

[Question]: There are 14 red crayons, 5 more blue crayons than red crayons, and 6 less yellow crayons than double the blue crayons. How many yellow crayons are there?
[Answer]: Red:14 crayons. Blue:5 + 14 = 19 crayons. Yellow:19(2) - 6 = 32 crayons.
So the answer is 32.

[Question]: When Diane turns 30, she will be half the age of Alex and twice as old as Allison. Diane is 16 years old now. What is the sum of the ages of Alex and Allison now?
[Answer]:
When Dianne turns 30, Alex will be 30 x 2 = 60 years old. Allison will be 30 / 2 = 15 years old then. Dianne will turn 30 in 30 - 16 = 14 years. Currently, the age of Alex is 60 - 14 = 46. Currently, Allison is 15 - 14 = 1 year old. So, the sum of Alex and Allison's ages now is 46 + 1 = 47 years old.
So the answer is 47.