Question

Mrs Wong bought some flour. She used 3 over 8 of it to bake some cakes and kept the rest. What percentage of the flour did she keep?

Answer 1

She kept
`1-(3)/(8)=(5)/(8)\cdot100\%=62,5\%`

Answer 2

Is she used 3/8, that means she kept 5/8 of it. So just find what 5/8 is as a percentage.

Hope I helped