Practice

A precast concrete girder acts compositely with a cast-in-place slab. The girder is normal-weight concrete with a unit weight of 145 pcf and $f'_c = 6{,}000$ psi; the slab is lightweight concrete with a unit weight of 115 pcf and $f'_c = 4{,}000$ psi. For a transformed-section analysis by ACI 318, the modular ratio of the girder concrete to the slab concrete is most nearly:

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