In the array of numbers below, each number above the bottom row is equal to three times the number immediately below it. What is the value of x + y?
27 x 81 -108
9 -18 27 36
3 -6 y -12
1 -2 3 -4
A. -45
B. -15
C. -2
D. 20
E. 77
The OA is A.
x = three times the number immediately below it, so x = 3*(-18) = -54
y = three times the number immediately below it, so y = 3*(3) = 9
x + y = -54 + 9 = -45. Option A.
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In the array of numbers to below, each number above the
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We see that x is -18 * 3 = -54AAPL wrote:In the array of numbers below, each number above the bottom row is equal to three times the number immediately below it. What is the value of x + y?
27 x 81 -108
9 -18 27 36
3 -6 y -12
1 -2 3 -4
A. -45
B. -15
C. -2
D. 20
E. 77
We see that y is 3 * 3 = 9.
Thus, x + y = -54 + 9 = -45.
Answer: A
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Vincen
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Hi AAPL.AAPL wrote:In the array of numbers below, each number above the bottom row is equal to three times the number immediately below it. What is the value of x + y?
27 x 81 -108
9 -18 27 36
3 -6 y -12
1 -2 3 -4
A. -45
B. -15
C. -2
D. 20
E. 77
The OA is A.
x = three times the number immediately below it, so x = 3*(-18) = -54
y = three times the number immediately below it, so y = 3*(3) = 9
x + y = -54 + 9 = -45. Option A.
According to the statement, we have that $$3\cdot y=27\ \ \Rightarrow\ \ \ y=9.$$ $$x=3\cdot\left(-18\right)\ \ \Rightarrow\ \ x=-54.$$ Then $$x+y=-54+9\ =\ -45.$$ Therefore, the correct answer is the option A.
