Question: Ali and Ernie lined up boxes to make circles. Ali used 8 boxes to make each of his circles and Ernie used 10 for his. If they had 80 boxes to begin with and Ali makes 5 circles, how many circles can Ernie make?
Answer: Ali made 5 circles with 8 boxes each so he used 5 * 8 = 40 boxes. There were 80 boxes to start with so now there are 80 - 40 = 40 boxes left. Ernie used 10 boxes to make one circle so with 40 boxes he can make 40 / 10 = 4 circles. The answer is 4.

Question: One-half of a pound of mangoes costs $0.60. How many pounds can Kelly buy with $12?
Answer: One pound of mangoes cost $0.60 x 2 = $1.20. So Kelly can buy $12 / $1.20 = 10 pounds of mangoes. The answer is 10.

Question: The sum of the three sides of a triangle is 50. The right side of the triangle is 2 cm longer than the left side. Find the value of the triangle base if the left side has a value of 12 cm.
Answer: If the left side of the triangle is 12, and the right side is 2 cm longer, the right side is 12 + 2 = 14 cm long. The sum of the left and right sides of the triangle is 14 + 12 = 26 cm. If the sum of all sides of the is 50, and the left and right sides of the triangle are 26, the triangle base is 50 - 26 = 24 cm. The answer is 24.

Question: Polly and Peter play chess. Polly takes an average of 28 seconds per move, while Peter takes an average of 40 seconds per move. The match ends after 30 moves. How many minutes did the match last?
Answer:
Both Polly and Peter played 30 / 2 = 15 moves each one. With an average of 28 seconds per move, Polly's moves lasted a total of 15 * 28 = 420 seconds. With an average of 40 seconds per move, Peter's moves lasted a total of 15 * 40 = 600 seconds. In total, the match lasted 420 + 600 = 1020 seconds. In minutes, the match lasted 1020 / 60 = 17 minutes. The answer is 17.