The perimeter of a field is 286 m. If the length of the field is 76 m, the width is

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_____ m.
A. 67
B. 77
C. 47
D. 57

The perimeter of a field is 286 m. If the length of the field is 76 m, the width is

p = 2(l + w) \ 286 = 2(76 + w) \ 143 = 76 + w \ 143 - 76 = w \ w = 67 : m : (a)