exam Maths Puzzle Numerical Ability

5x-10=-7x+1
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exam Other Question

Show that nC0+nC2+nC4+...=nC1+nC3+...=2^,where ^=n-1. The width of a rectangle is 7 ft. less than the length. The area of the rectangle is 120 ft 2(square). Find the width of the rectangle.