Maths

Last Monday me, Lachie c, and Keahn did maths together. Here is question one:
On the weekend, Tylah made a chocolate cake. If flour made up 65% of the mixture. what percentage of the cake was not flower?
 so we did 65% + 35% =100
we did 65% + 5%= 70%
 70%+30%=100% 
30%+5%=35%.