
急!!初中数学(方程)!懂英语和数学的来!
Thetotalpriceof24booksis$405.Someofthemaresoldat$15eachandtheothersat$20each.Findthen...
The total price of 24 books is $405.Some of them are sold at $15 each and the others at $20 each.Find the number of books that are sold at $15 each.
方程、方程、方程啊!!!!!!! 展开
方程、方程、方程啊!!!!!!! 展开
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答案是15本
15+9=24
15×15+9×20=405
15+9=24
15×15+9×20=405
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