I'm a half-wit and proud of it

There are some achievements that are going to kill me. The ones in Brain Challenge specifically. I finally got the "40% brain usage" one the other day and I dont' know if I can task my brain any more. I wish I knew what the key to success in that game was. Is it answering questions fast, right or wrong? Or answering questions right, no matter how long it takes? Either way at 40% I'm less than a half-wit and I'm proud of it.