The perimeter of a rectangular board is 24 cm. If its length is 9 cm and its width is one third of its length, what is its width?
A.2 cm
B.3 cm
C.4 cm
D.5 cm
A.2 cm
B.3 cm
C.4 cm
D.5 cm
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B. 3 cm
SOLUTION:
P = 2l + 2w
24 = 2(9) + 2w
24 = 18 + 2w
2w = 24 - 18
2w = 6
w = 3cm
CHECKING:
P = 2l + 2w
24 = 2(9) + 2(3)
24 = 18 + 6
24 = 24 ✓✓