Question

Vlad spent 20 minutes on his history homework and then completely solved x math problems that each took 2 minutes to complete. What is the equation that can be used to find the value of y, the total time that Vlad spent on his homework, and what are the constraints on the values of x and y?
A.y=2x+20; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20.
B. y=2x+20; x is any real number greater than or equal to 0, and y is any real number greater than or equal to 20.
C.y=20x+2; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20.
D.y=20x +2; x is any real number greater than or equal to 0, and y is any real number greater than or equal to 20.

Answer 1

ANSWER:

Option A is the correct answer

SOLUTION: As total time taken to do history homework was 20 mins

and time for maths homework was 2mins per ques

and total no. of ques were x

so, total time for maths homework was 2x mins

so, total time to complete homework is 20+2x mins

as no. of ques cannot be irrational so

Option A is correct answer