Add it up

Follow up to the English test from the other day is this maths test. I'm happy to say I got 18/20, surprising even myself. I only got stuck on #19 and #20. I knew how to figure out #19 so could see where I went wrong (memories of sitting next to Bruce in Mr. David's class) but #20 I couldn't really be bothered working out. But hey, no maths since year 10... I'm happy with that result. I must really be quite smart!