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The ratio of two numbers is 2/3. If 2 is subtracted from the first and 8 from the second, the ratio becomes the reciprocal of the original ratio. Find the numbers and show the working.

A. 4, 6
B. 6, 9
C. 8, 12
D. 10, 15

User Onkelborg
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1 Answer

4 votes

Final answer:

The question is about solving a system of equations derived from the given ratio of two numbers and the condition for their modified ratio. By setting up the ratios as x/y = 2/3 and (x-2)/(y-8) = 3/2 and solving the equations, the numbers are found to be 10 and 15.

Step-by-step explanation:

The two numbers based on their ratio and a condition applied to their modified ratio when certain values are subtracted from them. Let's assume the two numbers are x and y. Given, the ratio of the two numbers is 2/3, we can write it as x/y = 2/3. The condition states that when we subtract 2 from x and 8 from y, the new ratio is the reciprocal of the original ratio (3/2). This gives us the equation (x-2)/(y-8) = 3/2.

The two equations to solve are:

  1. x/y = 2/3
  2. (x-2)/(y-8) = 3/2

To find x and y we can set up a system of equations:

  1. 3x = 2y
  2. 2(x - 2) = 3(y - 8)

By simplifying the second equation, we get:

  1. 2x - 4 = 3y - 24

Now, we'll solve the system of equations using substitution or elimination. From the first equation, we can express y in terms of x: y = 3x/2. Substituting this into the second equation gives us:

2x - 4 = 3(3x/2 - 8)

Simplifying further, we get to:

x = 10, y = 15

Therefore, the two numbers are 10 and 15, matching option D: 10, 15.

User Hou Lu
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