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Choose the correct option.
If 12 file cabinets require 18 feet of wall space, how many feet of wall space will 30 cabinets require?
A30
B25
C50
D45
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SHORTCUT
by chain rule
12 18
30 (D) x (D)
30/12 = x/18 => 30/12 * 18 = 45
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12 cabinets 18 feet
1 cabinet = 18/12 = 1.5
therefore 1.5 * 30 =45
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