Question: A machine at the soda factory can usually fill a barrel of soda in 3 minutes. However this morning a leak went unnoticed and it took 5 minutes to fill one barrel. If the leak remains undetected, how much longer will it take to fill 12 barrels of soda than on a normal day when the machine works fine?
Answer with step-by-step thinking: On a regular day it would take 3 * 12 = 36 minutes. With the leak it will take 5 * 12 = 60 minutes. It will take 60 - 36 = 24 more minutes if the leak goes undetected.
So the answer is 24.


Question: Bob started out the week with $80. On Monday alone, he spent half the money. On Tuesday, he spent one-fifth of the amount left from Monday. On Wednesday, he spent 3/8ths of the amount left from Tuesday. How much does he have left now?
Answer with step-by-step thinking: On Monday, he spent half of $80 leaving him with $80 - (1 / 2) * $80 = $40. On Tuesday, he spent 1 / 5th of $40 leaving $40 - (1 / 5) * 40 = $32. On Wednesday, he spent 3 / 8ths of $32 leaving $32 - (3 / 8) * $32 = $20.
So the answer is 20.


Question: A jewelry store is restocking its shelves. The necklace stand, which can hold 12 necklaces, currently holds 5 necklaces. The ring display, which can hold 30 rings, currently holds 18 rings. The bracelet display, which can hold 15 bracelets, currently holds 8 bracelets. The store’s supplier charges $4 per necklace, $10 per ring, and $5 per bracelet. How much, in dollars, will the store need to pay to fill the displays?
Answer with step-by-step thinking:
The necklace stand needs another 12 – 5 = 7 necklaces. This will cost the store 7 * 4 = $28. The ring display needs another 30 – 18 = 12 rings. This will cost the store 12 * 10 = $120. The bracelet display needs another 15 – 8 = 7 bracelets. This will cost the store 7 * 5 = $35. In total, the store needs to pay 28 + 120 + 35 = $183.
So the answer is 183.