Question

如果买六根铅笔价钱等于买五块橡皮价钱,买六块橡皮比买五根铅笔多花1.1元那么一根铅笔和一块橡皮各几元

Answer 1

笔为X橡皮Y

6x=5y;6y-5x=1.1

x=5/6y;6y-5*5/6y=1.1

(36-25)/6y=1.1

y=1.1/(11/6)=6.6/11=0.6

X=5/6*0.6=0.5

铅笔0.5元,橡皮0.6元