Question

what should be subtractedfrom thrice the rational number -8/3 to get 5/2?

Answer 1

let the number required to be subtracted =x then
(-8/3)*3-x=5/2
-8-x=5/2
cross multipling we get
-16-2x=5
therefore
-2x=5+16
x=-21/2
x=-10.5