Question

If y = 45 when x = 120, what is the value of y when x = 240?

Answer 1

Answer: Y = 90

Step-by-step explanation:

For this question we will be using the process of cross multiplication.

We would often use this method when we the majority of our numbers are given, and we are tasked to find the missing variable; which in this case is Y.

1. Set up the fractions
   `(45)/(y) =(120)/(240)`
2. Multiply 240*45 to get 10,800
3. Multiply 120 by Y, essentially replacing the Y with something more malleable.
4. 
   `(10800)/(120y)`Divide accordingly
5. Y = 90

So, y = 90.