甲堆煤重7分之6吨,比乙堆煤少5分之3吨,丙堆煤比甲堆煤少14分之5吨,丙堆煤重多少吨?
丙堆煤
= 6/7 - 5/14
= ( 12-5) /14
= 7/14
= 1/2
=0.5吨