_比20米多20%,3吨比_千克少40%.

问题描述:

______比20米多20%,3吨比______千克少40%.

(1)20×(1+20%)
=20×1.2
=24(米);
(2)3吨=3000千克,
3000÷(1-40%)
=3000÷0.6
=5000(千克);
答:24米比20米多20%,,3吨比5000千克少40%.
故答案为:24,5000.