First, translate the words you're given into math: 2x-y = 60% of 5y.
60% = 60/100 = 0.60.
0.60(5y) = 3y
2x-y = 3y
>>
If this is the SAT and you have to do percentage by hand, you can always use fractions. So, 60% = 60/100 = 6/10 = 3/5.

.
Another quick percentage trick is that 10% of anything is just that number with the decimal point moved to the left one space. For ex: 10% of 5 = 0.5. And then you can multiply 0.5 by 6 (because 10%*6 = 60%) to get 3.
Back to the problem:
Now you have 2x-y = 3y. You are looking for what

equals to. Start by
separating the x and y variables by putting them on opposite sides of the equal sign:
2x-y = 3y
2x = 4y
You want x and y on one side and numbers on the other side. You also want y to be on the top of the fraction. What you want to do is
divide both sides by x first:

Finally,
isolate the variables by dividing by 4 on both sides:
The answer is C) 1/2
145.1% as a decimal is 1.451
Hope this satisfies your query! Have a good one :)
Answer:
C
Step-by-step explanation:
First, factor the original expression:

As we can see, D is the same as above. Eliminate D.
Go through each of the answer choices.
A:

This is equivalent to what we factored. Eliminate A.
B:

This is again equivalent to what we factored. Eliminate B.
C:

This cannot be simplified and it is not equivalent to what we have previously. C is not the equivalent expression.