Maths

Was dealing with Jamie's math an hour ago. The question goes like this:

A teacher has a certain amount of money. If she buy 4 balls, she need $3 more. If she buy 3 balls, she will have extra $4. What is the amount of money she has?

Jamie was very certain that her method worked, and she was teaching me how (eh, this part is weird coz I was supposed to help her with this question as she claimed she dunno how to do) and I couldn't really quite get her method, which goes like this:

$/ball ----- $ for 4 balls ----- (+$3) ----- $ for 3 balls ----- (-$4) ----- ok?
#####################################################
1 --------------- $4 ---------------- $7 ------------ $3 ------------ (-$1) --------x
2 --------------- $8 ---------------- $11 ----------- $6 ------------- $2 ---------x
3 --------------- $12 --------------- $15 ----------- $9 ------------- $5 ---------x
.
.
.
etc.

She got the answer as $22, while I did exactly the same method, I got $25. Neither one of us refused to admit the other party has the correct answer, Jamie was very confident and I was indignant that a 10 yo could get it correct.

So Jia intervened, so that we wouldn't have a tie.

The best part? She gave a totally different theory: the maths question is set wrongly.

In the end, it took a combined effort of Jia and me to solve it simultaneously, and the answer was indeed $25. Seriously, I wasted 15 minutes doing the trial-and-error method while I could solve it within 5 minutes using simultaneous equations.

Brain is getting rusty indeed.

P/S: I also got Jamie to edit the grammar error. The teacher was a she and later become a he. Had to add an S to it. Ha ha.

My obsession with neatness extend to Jamie's Chinese compo, almost had to got her to rewrite the whole thing coz sentence structure was too long-winded, too many repetitive words and super untidy!!!

She said "Oh Shit" immediately when Mum threatened her she won't get to go holiday in Dec and have to stuck with me if she can't complete her homework.

Ha, I'm her nemesis.