better than expected

Surprisingly, aunty's test questions were quite alright. Except for qn 2 when I 'played cheat'. I solved it by the good'ol algebric method and thereafter I worked backwards to do it via the conventional model method. According to aunty, she said that many of the students struggled with algebra because they grew up using the model method and even in secondary sch, they tried the model method. Not that the model method cannot be used but what happens if the numbers get too large? This is where the beauty of algebra comes. So that explains the difference between those whose IC # starts with 7, 8 & 9. I know that a few of my coursemates will snigger at the sentence in bold!