某食堂三月份烧煤1.2吨,四月份烧煤比三月份节约了1/4,四月份烧煤多少吨?

问题描述:

某食堂三月份烧煤1.2吨,四月份烧煤比三月份节约了1/4,四月份烧煤多少吨?

0.9吨

1.2*(1-1/4)
=6/5*3/4
=9/10
=0.9吨

1.2×(1-1/4)
=1.2×3/4
=0.9(吨)

﹙70-0.2﹚÷70 =69.8÷70 =349/350