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
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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.

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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
Answer:
11.81 m
Step-by-step explanation:
The area of a rhombus is computed as follows:
A = p*q*1/2
where p and q are the diagonals of the rhombus.
In this case:
A = AC*BD*1/2
A = 6*4*1/2
A = 12 square inches
It will take 2 years.
Year 1 :
4% 2.5k = 2.5k/100 × 4 = $100 in interest
$2.5k + $0.1k = $2.6k
Year 2 :
4% 2.6k = 2.6k/100 × 4 = $104 in interest
$100 + $104 = $204 > $200
There may be a simpler way to solve this using a formula for example, but I just solved this step by step. Please feel free to ask if you have any questions