Salem loves to write poems, and she always stores her poem in a creativity box kept safely in her home library. Last week, she created a poem with 20 stanzas. If each stanza has 10 lines, and each line has 8 words, calculate the total number of words in the poem. Give the rationale and then the answer.
Let's think step by step. If each line that Salem created in her poem has 8 words, the total number of words in a stanza, which is 10 lines, is 8 words / line * 10 lines / stanza = 80 words / stanza. With 20 stanzas, each containing 80 words per stanza, the total is 80 words / stanza * 20 stanzas = 1600 words in all the stanzas(poem).. The answer is: 1600.

Toby is filling his swimming pool for the summer. The pool normally takes 50 hours to fill. He knows his hose runs at 100 gallons per hour. Water costs 1 cent for 10 gallons. How many dollars does it cost to fill the pool? Give the rationale and then the answer.
Let's think step by step. The pool holds 5000 gallons of water because 50 x 100 = 5000. Every gallon costs $.001 because $.01 / 10 = $.001. It costs $5 to fill the pool because 5000 x $.001 = $5.. The answer is: 5.

Betty is 60 years old, and she is the oldest person in the family. Her daughter is 40 percent younger than she is, and her granddaughter is one-third her mother's age. How old is the granddaughter? Give the rationale and then the answer.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Let's think step by step. Betty's daughter is 40 / 100 * 60 = 24 years younger than she is. That means her daughter is 60 - 24 = 36 years old. So the granddaughter is 1 / 3 * 36 = 12 years old.. The answer is: 12.