Question 258728
C-cross country skis
D-downhill skis
1.{{{D=6C}}}
2.{{{D-C=1800}}}
Substitute eq. 1 into eq. 2,
2.{{{D-C=1800}}}
{{{6C-C=1800}}}
{{{5C=1800}}}
{{{C=360}}}
{{{D=6C}}}
{{{D=2160}}}
.
.
.
2160 pairs of downhill skis and 360 pairs of cross country skis.