Q: The running time of Beast of War: Armoured Command is 10 minutes longer than that of Alpha Epsilon, which is 30 minutes shorter than that of Millennium. If Millennium runs for 2 hours, what is the running time of Beast of War: Armoured Command in minutes?
A: One hour contains 60 minutes so 2 hours contain 60 * 2 = 120 minutes. Alpha Epsilon's running time is 30 minutes less than that of Millennium (which runs for 120 minutes) hence 120 - 30 = 90 minutes. Beast of War: Armoured Command runs for 10 minutes more than Alpha Epsilon hence 90 + 10 = 100 minutes. The answer is 100.

Q: Samuel has $5, $10, and $20 bills which amount to $150 in his wallet. His $10-bills amount to $50, and he has 4 $20-bills. How many bills does Samuel have in his wallet?
A: His $20 bills amount to 4 x $20 = $80. So the total amount of the $10 and $20 bills is $80 + $50 = $130. Hence, the remaining $5 bills amount to $150 - $130 = $20. This means that there are $20 / $5 = 4 $5 bills. There are also $50 / $10 = 5 $10 bills. Therefore, Samuel has 4 + 4 + 5 = 13 bills in his wallet. The answer is 13.

Q: A school choir needs robes for each of its 30 singers. Currently, the school has only 12 robes so they decided to buy the rest. If each robe costs $2, how much will the school spend?
A:
The school needs to buy 30 - 12 = 18 robes. So the school will spend 18 x $2 = $36. The answer is 36.