Question

Subtract 5 5⁄21 from 131⁄7 (reducing to lowest terms if necessary). A. 1019⁄7 B. 719⁄7 C. 1019⁄21 D. 719⁄21

Answer 1

`13(1)/(7)-5(5)/(21)=13(3)/(21)-5(5)/(21)=(13-5)+\left((3)/(21)-(5)/(21)\right)\\\\=8-(2)/(21)=\left(7+(21)/(21)\right)-(2)/(21)\\\\=7+(21-2)/(21)=7(19)/(21)`

The appropriate choice is ...

... D. 7 19/21