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Tutor profile: Edith V.

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Edith V.
Incoming Software Development Intern at Prudential
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Questions

Subject: Python Programming

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Question:

Create a function that contains an integer parameter to check if that integer is an odd number. The function should return true if it is odd. Otherwise, it should return false.

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Edith V.
Answer:

To check if a number is odd, you can use the modulo (%) operator. If the number is even, we know that the number can not be odd. We can use the expression: number % 2 == 0 to check if the number is even. If the expression is not equal to 0, the number must be odd. If the number was 3, we would calculate 3%2. We know that the modulo operator returns the remainder of 3 divided by 2 which equates to 1 remainder 1. 1 is not equal to 0 and that makes the number odd. On the other hand, if the number was 2, we would calculate 2%2. 2 divided by 2 equates to 1 remainder 0. 0 equals 0, signifying that 2 must not be an odd number. def isOdd(x): if (x % 2 == 0): return false return true

Subject: Computer Science (General)

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Question:

What is a constructor?

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Edith V.
Answer:

A constructor is a piece of code that initializes a newly-created object. It initializes the fields (variables of the class) to default values. This is executed whenever a new instance of the class is created.

Subject: Algebra

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Question:

Your friend, Mark, has 12 coins in his pocket. The 12 coins are either quarters or dimes. The 12 coins add up to $10 in value. How many of each coin does he have?

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Edith V.
Answer:

Let q = the number of quarters Let d = the number of dimes Since there are 40 coins total, we can represent the number of quarters in terms of dimes with the equation: Equation 1: q = 40 - d If Mark had one dime, he would have 10 x 1 = 10 cents. If Mark had two dimes, he would have 10 x 2 = 20 cents. This relation can be represented as 10 x d = 10d where d represents the number of dimes. Similarly, 25q can be used to represent the quarter relation. We know that there are a certain number of dimes and quarters that add up to the total value of $10. Since our dime and quarter relations are in terms of 10 and 25, respectively (rather than 0.10 and 0.25), the total value will be increased by a factor of 100. So 10 x 100 = $1000 total. So, we can create an equation: Equation 2: 10d + 25q = 1000 With the two equations, we can substitute equation 1 into equation 2. 10d + 25(40 - d) = 1000 Then, distribute the numbers to get rid of the parentheses. 10d + 1000 - 25d = 1000 Add like terms. -15d + 1000 = 1000 Subtract 1000 from both sides. -15d = 0 Divide each side by -15. d = 0. Thus, there are 0 dimes. Plug in the d value to the equation 1 to find out the number of quarters. q = 40 - 0 q = 40 Thus, there are 40 quarters and 0 dimes. To check, we know that 40 quarters is 40 x 0.25 = 10 which is the total value stated in the problem. Thus, this solution is correct.

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