LulaBrazilia wrote:
In the table above, what is the number of green marbles in jar R?
A) 70
B) 80
C) 90
D) 100
E) 110
The table implies the following equations:
x+y = 80
y+z = 120
x+z = 160.
An alternate approach is to PLUG IN THE ANSWERS, which represent the value of z.
When the correct answer choice is plugged in, x+y = 80, as indicated by the top equation.
Answer choice C: z=90
y+90 = 120 --> y=30.
x+90 = 160 --> x=70.
x+y = 70+30 = 100.
x+y is too big.
To decrease the value of x+y, we must INCREASE the value of z.
Eliminate A, B and C.
Answer choice D: z=100
y+100 = 120 --> y=20.
x+100 = 160 --> x=60.
x+y = 60+20 = 80.
Success!
The correct answer is
D.
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