用15克盐配制成含盐率为5%的盐水,需加水多少克?正确的列式是( ) A.(15-155%)5% B.15×5%-15 C.15÷5%+15 D.15÷5%-15
问题描述:
用15克盐配制成含盐率为5%的盐水,需加水多少克?正确的列式是( )
A. (15-155%)5%
B. 15×5%-15
C. 15÷5%+15
D. 15÷5%-15
答
15÷5%-15;
故选:D.