VJesus12 wrote:If y = 3x, then the value of 10% of y is
(A) 0.003x
(B) 0.3x
(C) 3x
(D) 30x
(E) 300x
Let x=10 and y = 3x = 3*10 = 30.
The question stem asks for the value of 10% of y:
10% of y = (10/100)(30) = 3.
Now plug x=10 into the answers to see which yields the target value of 3.
Only
B works:
0.3x = 0.3(10) = 3.
The correct answer is
B.
Algebra:
Since y = 3x, we get:
10% of y = 0.1y = 0.1(3x) = 0.3x.
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