Q: Pulsar, the shuffle-dancing bear, Polly, the pink prancing poodle, and Petra, the proud portly pachyderm, are entertainers at the Big Top Circus. In one show, Pulsar stands on his two back legs for a total of 10 minutes. Then, Polly stands on her back legs for three times as long as Pulsar. And then, finally, Petra stands of his back legs for one-sixth as long as Polly. What is the combined length of time, in minutes, that the three entertainers stand on their back legs?
A: Polly stands on her back legs for 3 * 10 = 30 minutes. Petra stands on his back legs for 30 / 6 = 5 minutes. In total, the three entertainers stand on their back legs for 10 + 30 + 5 = 45 minutes'. The answer is 45.

Q: Aubriella is pouring water into a 50-gallon fish tank at the rate of 1 gallon every 20 seconds. How many more gallons will she have to pour into the tank to fill the tank if she poured water into the fish tank for 6 minutes?
A: When she poured water into the gallon for 6 minutes, the total time in seconds she took is 6 minutes * 60 seconds / minute = 360 seconds. If in 20 seconds she poured 1 gallon of water into the tank, in 360 seconds, she poured 360 seconds / 20 seconds / gallon = 18 gallons of water into the tank. Aubriella will have to pour 50 gallons - 18 gallons = 32 more gallons into the tank to fill the tank. The answer is 32.

Q: John is 10 years old. His sister is twice his age. When he is 50 years old, how old will his sister be?
A:
His sister is 10 * 2 = 20 years old. Their age difference is 20 - 10 = 10 years. Therefore when he is 50 she will be 50 + 10 = 60 years old. The answer is 60.