Miles is a musician. He owns three fewer trumpets than he has fingers, and two more guitars than he has hands. He also owns two more trombones than he has heads, and one fewer French horn than he has guitars. What is the total number of musical instruments that Miles owns?
Let's think: Three fewer trumpets than Miles has fingers is 10 - 3 = 7 trumpets. Two more guitars than he has hands is 2 + 2 = 4 guitars. Two more trombones than he has heads is 2 + 1 = 3 trombones. And one fewer French horn than he has guitars is 4 - 1 = 3 French horns. Altogether, Miles owns 7 + 4 + 3 + 3 = 17 musical instruments.. The answer is: 17.

Isabella earns $5 an hour babysitting. She babysits 5 hours every day, 6 afternoons a week. After babysitting for 7 weeks, how much money will Isabella have earned?
Let's think: She earns 5 * 5 = $25 in a day. In a week she earns 25 * 6 = $150. In 7 weeks, she earns 150 * 7 = $1050.. The answer is: 1050.

Eden's mom is twice as old as Eden, who is twice as old as Devin. If Devin is 12 years old, what's the average age of the three?
Let's think: If Devin is 12 years old, then Eden is 2 * 12 years = 24 years old. Since Eden's mom two times older than Eden, her age is 24 years * 2 = 48 years. In total, they have 48 years + 24 years + 12 years = 84 years. The average age for the three is 84 years / 3 people = 28 years / person.. The answer is: 28.

A play was held in an auditorium and its ticket costs $10. An auditorium has 20 rows and each row has 10 seats. If only 3/4 of the seats were sold, how much was earned from the play?
Let's think:
There are 20 x 10 = 200 seats in the auditorium. Only 200 x 3 / 4 = 150 seats were sold. Hence, the earnings from the play is $10 x 150 = $1500.. The answer is: 1500.