Question: The news announced a $0.4 oil price rollback this Friday. Mr. Deane decided to only fill his gas tank with 10 liters of gas today and then another 25 liters on Friday. If the cost per liter of gas is $1.4 today, how much will Mr. Deane spend for his 35 liters of gas?
Answer: Mr. Deane will spend $1.4 / liter x 10 liters = $14 for the 10 liters of gas today. The price of the gas per liter on Friday will be $1.4 / liter - $0.4 / liter = $1 / liter. So, he will spend $1 / liter x 25 liters = $25 for the 25 liters of gas on Friday. Thus, Mr. Deane will spend a total of $14 + $25 = $39 for the 35 liters of gas. The answer is 39.
[Question]Carly is thinking about buying a wallet that costs $22 and a purse that costs $3 less than four times the cost of the wallet. What is the combined cost of both items?
[Answer]First quadruple the price of the wallet: $22 * 4 = $88. Then subtract $3 to find the cost of the purse: $88 - $3 = $85. Then add the price of the wallet and purse to find the total cost: $85 + $22 = $107. The answer is 107.
Q: Jerry was asked by her mom to do grocery shopping. He needs to buy 2 liters of mustard oil that costs $13 per liter, 3 pounds of gluten-free penne pasta that costs $4 per pound, and 1 pound of pasta sauce that costs $5. If Jerry can keep the rest of the $50 after grocery shopping, how much money will he have?
A: The cost of 2 liters of mustard oil is $13 x 2 = $26. The cost of 3 pounds of gluten - free penne pasta is $4 x 3 = $12. So, Jerry spent a total of $26 + $12 + $5 = $43 for grocery shopping. Thus, Jerry will have $50 - $43 = $7 for himself. The answer is 7.
Question: There were three jars of candy in the cabinet. The jar of peanut butter candy had 4 times as much candy as the jar of grape candy. The jar of grape candy had 5 more pieces of candy than the jar of banana candy. How many pieces of candy did the peanut butter jar have if the banana jar had 43?
Answer: The grape jar had 43 + 5 = 48 pieces of candy. The peanut butter jar had 48 * 4 = 192 pieces of candy. The answer is 192.
[Question]One-fourth of the airing time of a television program is spent on commercials. If there are 6 thirty-minute programs, how many minutes are spent on commercials for the whole duration of the 6 programs?
[Answer]The total time of the programs is 6 programs * 30 minutes / program = 180 minutes. A quarter of this time is spent on commercials, so that's 180 minutes / 4 = 45 minutes. The answer is 45.
[Question]There are 20 hands in Peter’s class, not including his. Assume every student in the class has 2 arms and 2 hands. How many students are in Peter’s class including him?
[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.
user
There are 20 + 2 of Peter’s hands = 22 hands in Peter’s class including his. There are 22 hands / 2 hands per student = 11 students. The answer is 11.