Question

What should be added to (10/20+4/8-9/18) to get 1?

Answer 1

(10/20+4/8-9/18) + x = 1

x = 1 - (10/20+4/8-9/18)

x = 1 - (1/2+1/2+1/2)

x = 1 - (1+1+1/2 = 3/2)

x = 1 - 3/2

x = 2-3/2

x = -1/2

therefore (10/20+4/8-9/18) + (-1/2) = 1