Mark M. answered 02/19/15
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Let x = large number
y = small number
Then, since x/y = 3R20, x = 3y + 20
Replace x by 3y + 20 in the equation x + y = 300 to get: 3y + 20 + y = 300
4y = 280
y = 70
So, x = 230 and y = 70
x - y = 160 The answer is (c).