exam Maths Puzzle Numerical Ability

express the following as ratios having the same units in the numerator and denominator: 50 inches to 3 yards, 20 months to 3 years, 4 pounds to 42 ounces, 8 quarters to 12 dimes

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I have to solve by using the quadratic formula.

3x^2=11x+4.

I get -1/3 and 4

Am i correct?

Thanks for helping me. Show that nC0+nC2+nC4+...=nC1+nC3+...=2^,where ^=n-1.