某工地运进一批沙子和水泥,运进沙子袋数是水泥的2倍。每天用去30袋水泥,40袋沙子,几天以后,水泥全部用完,而沙子还剩120袋,这批沙子和水泥各多少袋?5~8m2E2X1U9{2O
算式:提示9|,f4F.r(u4I0t-R3G)b0p.t5~8m2E2X1U9{2O
答:运进水泥0x-s's0l*P2}(f2Q'Y4G4]*d+P/n9Y.G'u袋,沙子9P/a*\'b'N5p:Z*b/`4V7F袋。5~8m2E2X1U9{2O