Jackie can do 5 push-ups in 10 seconds. How many push-ups can she do in one minute if she takes two 8-second breaks? Give the rationale and then the answer.
Let's think step by step. There are 60 seconds per minute, so Jackie's push - up routine takes 1 * 60 = 60 seconds. Her breaks last 2 * 8 = 16 seconds. She does push - ups for 60 - 16 = 44 seconds. She can do a push - up in 10 / 5 = 2 seconds. Therefore, Jackie can do 44 / 2 = 22 push - ups in one minute with breaks.. The answer is: 22.

At a station, a train comes every 5 minutes leaving 200 passengers and taking 320 others. How many different passengers step on and off a train at the station within an hour? Give the rationale and then the answer.
Let's think step by step. At every passenger exchange there are 200 + 320 = 520 different people. One hour is 60 minutes, so during one hour, a train comes 60 minutes / hour / 5 minutes / train = 12 times. So during one hour, 12 trains * 520 passengers / train = 6240 different passengers step on and off the train.. The answer is: 6240.

Kenneth has $50 to go to the store. Kenneth bought 2 baguettes and 2 bottles of water. Each baguette cost $2 and each bottle of water cost $1. How much money does Kenneth have left? Give the rationale and then the answer.
Let's think step by step. The cost of the baguettes is 2 $2 = $4. The cost of the water is 2 $1 = $2. The total cost of the shopping is $4 + $2 = $6. Kenneth has $50 $6 = $44 left.. The answer is: 44.