Clothing dan has 4 pairs of white​ socks 5 pairs of black​ socks, and several pairs of blue socks. has 12 pairs of socks altogether. How many pairs of blue socks does ​have? Write the ratio of the number of pairs of socks to the number of pairs of blue socks. has 3 pairs of blue socks. The ratio of the number of pairs of socks to the number of pairs of blue socks is