100x(1+25%)=125(吨) 160x(1+20%)=192(吨) 25÷25%=100 (吨) 25÷25%x (1+25%) =125(吨) 100x(1+25% )+100=225 (吨) 48÷(1+20%)=40(人) 125÷(1+25%)=100 (吨) 63÷20%=315(千米)