Answer this question:The Arevalo family went out to dinner. The smoky salmon costs $40, the black burger costs $15, and the chicken katsu costs $25. If the bill includes a 10% service charge and 5% tip, how much change will Mr. Arevalo receive from his $100?
The total amount spent on food is $40 + $15 + $25 = $80. The service charge is $80 x 10 / 100 = $8. The tip is $80 x 5 / 100 = $4. So, Mr. Arevalo had to pay $80 + $8 + $4 = $92 in all. Therefore, his change will only be $100 - $92 = $8.
The answer is 8.

Answer this question:Before Cameron broke his right arm, he was able to type 10 words per minute on his phone. After he broke his arm, he had to use his left hand for a while, and he could only type 8 words per minute. What is the difference between the number of words he could type in 5 minutes before and after he broke his arm?
Before Cameron broke his hand he could type 5 × 10 = 50 words in 5 minutes. After he broke his hand he could only type 5 × 8 = 40 words in 5 minutes. The difference between the number of words he could type in 5 minutes before and after he broke his arm is 50 - 40 = 10 words.
The answer is 10.

Answer this question:Among the career home run leaders for MLB, Hank Aaron has 175 fewer than twice the number that Dave Winfield has. Hank Aaron hit 755 home runs. How many home runs did Dave Winfield hit in his career?
Let x be the number of home runs Dave Winfield hit. 755 = 2x - 175. 930 = 2x. x = 465 home runs.
The answer is 465.

Answer this question:Max attended 40 college courses in 2 years. Sid attended four times as many college courses as Max in the same period. What's the total of college courses they both attended?
If Sid attended four times as many college courses as Max, he attended 4 * 40 = 160 college courses. The total of college courses they both attended is 160 + 40 = 200.
The answer is 200.