IshanGre wrote:

GreenlightTestPrep wrote:

GreenlightTestPrep wrote:

If 12x + 2y is 80% of 5y, what is the value of x/y ?

A) 1/6

B) 1/4

C) 2/5

D) 1/2

E) 5/8

GIVEN: 12x + 2y is 80% of 5y

Rewrite as: 12x + 2y = (80/100)(5y)

Evaluate to get: 12x + 2y = 4y

Subtract 2y from both sides of the equation to get: 12x = 2y

Divide both sides by y to get: 12x/y = 2

Divide both sides by 12 to get: x/y = 2/12Simplify: x/y = 1/6

Answer: A

Cheers,

Brent

Brent I am unable to understand the highlighted , pls elucidate.

Once we know that 12x = 2y, we must determine the value of x/y

To do so, we must follow the Golden Rule of Equation Solving:

what you do to one side of the equation, you must do to the other side. So, to move the y to the left side of the equation, I took 12x = 2y and divided BOTH sides by y to get: 12x/y = 2

To move the 12 to the left side, I took 12x/y = 2 and divided BOTH sides by 12 to get: x/y = 2/12

Does that help?

Cheers,

Brent

_________________

Brent Hanneson – Creator of greenlighttestprep.com

Sign up for our free GRE Question of the Day emails