We have a question: The basketball team sold 50 cupcakes for $2 each and 40 cookies for $0.5 each. Then the money from their sales was used to buy two basketballs that cost $40 each. The rest of the money was used to buy 20 bottles of energy drinks. How much does a bottle of energy drink cost?
And an answer: 2
So how you got the answer?
The basketball team earned 50 x $2 = $100 from selling cupcakes. They also earned 40 x 0.5 = $20 from selling cookies. So their total earnings was $100 + $20 = $120. The two basketballs cost $40 x 2 = $80. Thus, $120 - $80 = $40 was used to buy the 20 bottles of energy drinks. Therefore, each bottle of energy drink costs $40 / 20 = $2.

We have a question: A 40 meters rope was cut into 2 parts in the ratio of 2:3. How long is the shorter part?
And an answer: 16
So how you got the answer?
The rope was cut into 2 + 3 = 5 parts. So each part is 40 / 5 = 8 meters long. Since the shorter part is consists of 2 parts, then it is 8 x 2 = 16 meters long.

We have a question: A Statistics student wants to find out the average daily allowance of the middle school students. According to his survey, 2/3 of the students receive an average of $6 allowance per day while the rest gets an average of $4 a day. If he surveyed 60 students, what is the total amount of money those 60 students get in a day?
And an answer: 320
So how you got the answer?
There are 60 students x 2 / 3 = 40 students who have a $6 daily allowance. While there are 60 students - 40 students = 20 students who have a $4 daily allowance. The sum of the allowances of the 40 students who received $6 daily is 40 students x $6 / day = $240. The sum of the allowances of the 20 students who received $4 daily is 20 students x $4 / day = $80. The total daily amount of money of those 60 students is $240 + $80 = $320.