Compare the NC scattering of e and of of the same energy on the

Compare the NC scattering of ν_e and of ν_μ of the same energy on the valence quarks of a nucleus. Both cross-sections are proportional to a combination of the Z-charge factors squared of the quarks. Consider the ratio of the contributions of the left and right quarks in the two cases. How large is the ratio between these ratios?