[Question]: Two siblings, Eman and Frank, agreed to buy a new computer table, computer chair, and a joystick. The computer table costs $140, the computer chair costs $100, and the joystick costs $20. Eman agreed to pay for the computer chair while Frank agreed to pay for the computer table. Then Frank agreed to pay 1/4 of the price of the joystick and the rest will be paid by Eman. How much more money will Frank spend than Eman?
[Answer]: Frank will pay $20 x 1 / 4 = $5 for the joystick. Eman will pay $20 - $5 = $15 for the joystick. So, Frank will pay a total of $140 + $5 = $145. While Eman will pay a total of $100 + $15 = $115. Therefore, Frank will spend $145 - $115 = $30 more than Eman.
So the answer is 30.

[Question]: Sylvie is feeding her turtles. Each turtle needs 1 ounce of food per 1/2 pound of body weight. She has 30 pounds of turtles. Each jar of food contains 15 ounces and costs $2. How much does it cost to feed the turtles?
[Answer]: She needs 60 ounces of food because 30 / .5 = 60. She needs 4 jars of food because 60 / 15 = 4. It will cost $8 to feed them because 4 x 2 = 8.
So the answer is 8.

[Question]: Charlie owns one flute, two horns, and a harp. Carli owns twice as many flutes as Charlie, half as many horns as Charlie, but no harps. What is the combined total number of musical instruments owned by Charlie and Carli?
[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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Charlie owns one flute, two horns, and a harp for a total of 1 + 2 + 1 = 4 instruments. Twice as many flutes as Charlie is 2 * 1 = 2 flutes,. Half as many horns as Charlie is 2 / 2 = 1 horn. Thus, Carli owns 2 + 1 = 3 instruments. Therefore, the combined total number of musical instruments owned by Charlie and Carli is 4 + 3 = 7 instruments.
So the answer is 7.