茄子、豆角、黄瓜共占:1-40%=60%,豆角占:45%+1/5-60%=5%,
所以,黄瓜占:45%-5%=40%,茄子占:1/5-5%=15%.
这四种菜共重:25÷(40%-15%)=100(千克).
韭菜重:100×60%=60(千克).