Question: If 100 pieces, each 15 centimeters long, are cut from a 51-meter long ribbon, how much ribbon remains ?
Answer with step-by-step thinking: 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: The Chrysler Building has 11 more floors than the Leeward Center. Together they have a total of 35 floors. How many floors does the Chrysler Building have?
Answer with step-by-step thinking: Let L = Leeward Center. Chrysler = L + 11. L + L + 11 = 35. 2L + 11 = 35. 2L = 24. Leeward = 12 floors. Chrysler = 12 + 11 = 23 floors. The Chrysler Building has 23 floors.
So the answer is 23.


Question: Emma traveled by car 280 miles in 2 hours 20 minutes. What was the average speed of the car in miles per hour?
Answer with step-by-step thinking:
We first convert the time of 4 hours 20 minutes in minutes 2 hours 20 minutes = 2 × 60 + 20 = 140 minutes. Average speed S is given by distance / time. Hence S = 280 miles / 140 minutes = 2 mile / minute. There are 60 minutes in an hour so the speed is 2 * 60 = 120 miles / hour.
So the answer is 120.